Answer:
COOH is the carboxylic acid.
in a recrystallisation, why are the newly formed crystals washed with cold solvent?
a. To wash off any impurities that have crystallized on the pure crystal
b. To slightly diddolve the crytals to give the a more rounded shape
c. To wash off the film of solvent which contains the impurities
In a recrystallisation process, newly formed crystals are washed with cold solvent A. to wash off any impurities that have crystallized on the surface of the pure crystals.
Recrystallization is a process that is used to purify compounds in which they are recrystallized from a solvent. A sample that has impurities is dissolved in a minimum quantity of hot solvent to give a concentrated solution, which is then cooled slowly to enable the pure crystals to form, and then the crystals are washed with cold solvent. Recrystallization is carried out using a solvent in which the impurities have low solubility, the compound has high solubility, and the solvent does not react with the compound.
Recrystallization is essential since the compound's purity can affect the chemical properties of the substance. The process of washing the newly formed crystals is to remove any impurities that may have formed on the surface of the pure crystals. Cold solvent is used because it has low solubility, and it cannot dissolve the crystals, making it possible to wash off the impurities without dissolving the crystal.Aside from removing the impurities, washing the crystals with cold solvent also helps in getting rid of the solvent that contains impurities. The washing process is essential to achieve the maximum purity possible when recrystallizing a sample. Therefore the correct option is A
The complete question is :
In a recrystallisation, why are the newly formed crystals washed with cold solvent?
a.
To wash off any impurities that have crystallized on the surface of the pure crystals.
b.
To wash off the film of solvent which contains the impurities.
c.
To cool down the crystals.
d.
To slightly dissolve the crystals to give them a more rounded shape.
Know more about recrystallisation process here:
https://brainly.com/question/15710621
#SPJ11
At a certain temperature and pressure, chlorine gas has an average velocity of 324 m/s. What is the average velocity of sulfur dioxide gas under the same conditions?
The average velocity of sulfur dioxide gas under the same conditions is approximately 303 m/s.
Under the same temperature and pressure conditions, the average velocity of a gas is proportional to the square root of its molar mass. Therefore, we can use the following formula to find the average velocity of sulfur dioxide (SO2) gas:
vSO2 = (MSO2 / MCl2)1/2 × vCl2
where vCl2 is the average velocity of chlorine gas, MSO2 is the molar mass of sulfur dioxide, and MCl2 is the molar mass of chlorine gas.
The molar mass of SO2 is approximately 64 g/mol, and the molar mass of Cl2 is approximately 71 g/mol. Therefore:
vSO2 = (64 g/mol / 71 g/mol)1/2 × 324 m/s
vSO2 = 0.936 × 324 m/s
vSO2 ≈ 303 m/s
Learn more about temperature here:
https://brainly.com/question/11464844
#SPJ1
Compounds:
A. Ethanol
B. Water
C. Methanol
D. 1-butanol
E. Hexane
F. Acetone
Prediction:
Fastest
Slowest
CH₂CH₂OH
H₂O
CH,OH
CH3CH₂CH₂CH₂OH
CH₂CH₂CH₂CH₂CH₂CH3
CH3COCH3
Reason for prediction:
Fastest to Slowest:- Hexane 1-butanol Ethanol Methanol Water Acetone
What is molecular structure?The ranking of the compounds from fastest to slowest can be determined by their molecular structure, intermolecular forces, and boiling points. Hexane, with its non-polar structure, has only weak London dispersion forces between its molecules, making it the fastest compound. 1-butanol has a longer carbon chain than ethanol, allowing for stronger intermolecular forces, which causes it to be slower.
What is Hydrogen bond?Ethanol, methanol, and water have polar molecules and are capable of forming hydrogen bonds. However, methanol and ethanol have smaller molecular weights and shorter carbon chains, which causes them to be faster than water. Finally, acetone has a polar carbonyl group, but its smaller molecular weight and lack of hydrogen bonding capability causes it to be the slowest compound.
To know more about Hexane visit:-
brainly.com/question/30908383
#SPJ1
During a lab experiment, 48.62 grams of magnesium reacted with 32.00 grams of oxygen to produce magnesium oxide. What is the empirical formula for magnesium oxide?(atomic masses: Mg = 24.31 and O = 15.99)
The empirical formula for magnesium oxide is MgO, indicating that there is one atom of magnesium and one atom of oxygen in the compound. We can find it in the following manner.
To find the empirical formula for magnesium oxide, we need to determine the mole ratio between magnesium and oxygen in the reactants and use that to write the simplest whole-number ratio of atoms in the compound.
First, we need to convert the masses of magnesium and oxygen to moles using their atomic masses:
Moles of magnesium = 48.62 g / 24.31 g/mol = 2.00 mol
Moles of oxygen = 32.00 g / 15.99 g/mol = 2.00 mol
Next, we need to determine the mole ratio by dividing each of the mole amounts by the smallest mole amount:
Moles of magnesium / smallest mole amount = 2.00 mol / 2.00 mol = 1
Moles of oxygen / smallest mole amount = 2.00 mol / 2.00 mol = 1
The mole ratio is 1:1, which means that the empirical formula of magnesium oxide is MgO.
Therefore, the empirical formula for magnesium oxide is MgO, indicating that there is one atom of magnesium and one atom of oxygen in the compound.
Learn more about empirical formula here brainly.com/question/14044066
#SPJ4
what is the percent ionization of a 0.337 m hf solution? ka of hf is 3.5 x 10-4 .
The percent ionization of a 0.337 M HF solution can be calculated using the Ka of HF, which is 3.5 x 10-4.
The percentage oxidized indicates what proportion of the starting substance has been converted into ions.
As a result, we evaluate the concentration of the ion in solution by contrasting it to the initial concentration of the neutral species.
In a particular solution of a mild acid, the percentage of ionization will change depending on the initial concentration of the acid, and it will get lower as the concentration of the acid gets higher.
1. Write the ionization equilibrium expression for HF:
HF ⇌ H+ + F-
Ka = [H+][F-] / [HF]
2. Assume 'x' is the concentration of H+ and F- ions at equilibrium, so:
Ka = (x)(x) / (0.337 - x)
3. Plug in the given Ka value (3.5 x 10^-4) and solve for 'x':
3.5 x 10^-4 = (x)(x) / (0.337 - x)
4. Solving for 'x' using a calculator or a suitable approximation method, you will get the value of 'x', which represents the equilibrium concentration of H+ ions.
5. Calculate the percent ionization by dividing the concentration of H+ ions (x) by the initial concentration of HF (0.337 M) and multiplying by 100:
% ionization = (x / 0.337) x 100
Using this method, you can find the percent ionization of the 0.337 M HF solution.
To know more about the percent ionization https://brainly.com/question/29651327
#SPJ11
A 1.350 mol gas sample has a volume of 3.51 L and a pressure of 0.925 atm. At what temperature was this gas collected?
The temperature of the gas sample was [tex]269 Kelvin (K).[/tex]
To solve this problem, we can use the ideal gas law:
[tex]PV = nRT[/tex]
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to rearrange the equation to solve for T:
[tex]T = PV/nR[/tex]
Now we can plug in the given values and solve for T:
[tex]T = (0.925 atm)(3.51 L)/(1.350 mol)(0.0821 L·atm/mol·K)T = 269 K[/tex]
Therefore, the temperature of the gas sample was [tex]269 Kelvin (K).[/tex]
To learn more about temperature please visit -
https://brainly.com/question/11464844
#SPJ1
6. Rank the following compounds from smallest to largest molar mass.
Smallest = 1; Largest = 4. To earn full credit, work must be shown for all four
molar mass calculations! (11 pts)
a. SiH
b. Co
C. CH3OH
d. C₂H6
I
Answer:
d < c < a < b
Explanation:
The molar mass of a compound is the sum of the atomic masses of all the atoms in its chemical formula. Here are the molar masses of the four compounds you have:
a. SiH4: (1 × 28.09 g/mol) + (4 × 1.01 g/mol) = 32.13 g/mol
b. Co: 58.93 g/mol
c. CH3OH: (1 × 12.01 g/mol) + (4 × 1.01 g/mol) + (1 × 16.00 g/mol) = 32.05 g/mol
d. C2H6: (2 × 12.01 g/mol) + (6 × 1.01 g/mol) = 30.07 g/mol
So, from smallest to largest molar mass, the order is: d < c < a < b.
true or false: the volume of space in the tube is the volume of the hydrogen and the same space is also the volume of the water vapor
The statement that the volume of space in the tube would be equal to the sum of the volumes of hydrogen and water vapor is true if the tube is exposed to the atmosphere.
The assertion might not be accurate, though, if the tube is inside a closed system.
It relies on the circumstances surrounding the tube's observation. Assuming the tube is at equilibrium and the hydrogen and water vapor are thoroughly mixed inside the tube, if the tube is open to the atmosphere, then the amount of space in the tube would indeed equal the combined volume of hydrogen and water vapor.
However, if the tube is in a closed system, like a sealed container, the volume of the space inside the tube might not be the same as the volume of the hydrogen and water vapor because the gas molecules there might be interacting with the container's walls or going through pressure or temperature changes. Consequently, the claim may be accurate or untrue depending on the specific context.
learn more about water vapor here
https://brainly.com/question/1361830
#SPJ1
3
2.035g of hydrogen gaz prockset)
a pressure of 1.015 atm in a 9.00.
Container at -211.76 °c . what will be
be the temperature in °c If an
additional
be the 2.099 gram of hydrogen
gas is added to the container and
the pressure increases to 20.15 atm
The final temperature is 280.59 degrees Celsius.
Who or what is putting pressure on the ATM?The term atmospheres (atm), defined as follows: A mercury column one millimetre high would impose a pressure of one atm, or 1.01325 x 105 Pa. millimetres of mercury (mmHg). One atmosphere of pressure is generated by a mercury column that is 760 mm high. Because pressure and force are connected, you may use the physics equation to compute one if you know the other.
P1V1/T1 = P2V2/T2
Where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.
Given:
Initial pressure (P1) = 1.015 atm
Initial volume (V1) = 9.00 L
Initial temperature (T1) = -211.76 °C (62.39 K)
Mass of hydrogen gas initially (m1) = 2.035 g
Additional mass of hydrogen gas added (m2) = 2.099 g
Final pressure (P2) = 20.15 atm
PV = nRT
n1 = m1/MH2 = 2.035 g / 2.016 g/mol = 1.011 mol
n2 = m1/MH2 + m2/MH2 = 2.035 g / 2.016 g/mol + 2.099 g / 2.016 g/mol = 2.059 mol
We can assume that the volume of the container is constant, so we can set V1 = V2 in the combined gas law equation:
P1/T1 = P2/T2
Solving for T2:
T2 = P2T1V1 / (P1*V2)
Substituting the values:
V2 = V1 = 9.00 L
T2 = (20.15 atm)(62.39 K)(9.00 L) / (1.015 atm)(2.059 mol)(8.314 J/(mol*K))
T2 = 553.75 K or 280.59 °C
To know more about temperature visit:-
https://brainly.com/question/30863015
#SPJ1
Question:
A container holds 2.035 grams of hydrogen gas at a pressure of 1.015 atm and a temperature of -211.76 °C. What will be the temperature in °C if an additional 2.099 grams of hydrogen gas is added to the container and the pressure increases to 20.15 atm?
What would you see when titrating if an indicator was not added? a) no color change would occur; it would not be clear when the equivalence point was reached. b) a color change would still occur; it would not be clear when the equivalence point was reached. c) a color change would still occur, the equivalence point would still be identifiable. d) no color change would occur; the equivalence point would still be identifiable
When titrating if an indicator was not added, you would see: no color change and it would not be clear when the equivalence point was reached. The correct option is Option A.
Titrating is the process of analyzing or measuring the concentration of a solution (titrant) by adding a solution with a known concentration (titrant) drop by drop until the chemical reaction is complete. At the point when the chemical reaction is complete, we have reached the equivalence point.
An indicator is added to change color when the solution reaches the equivalence point, allowing us to precisely measure the endpoint. The indicator gives an observable signal, typically a color change, to show that the endpoint has been achieved. In the absence of an indicator, there would be no signal to indicate the endpoint was reached.
The equivalence point would still be identifiable, but it would be more difficult to precisely determine the endpoint. Titrations that rely on indicators are typically used to determine the concentration of an unknown acid or base solution. The type of indicator used varies based on the pH range of the unknown solution.
For example, methyl orange and phenolphthalein are indicators used in the titration of acids and bases, respectively.
To know more about Titrating refer here:
https://brainly.com/question/27107265#
#SPJ11
Why hexane has higher boiling point than methanol
Hexane has a higher boiling point than methanol due to differences in their intermolecular forces.
Hexane is a non-polar molecule with only weak London dispersion forces between molecules, whereas methanol is a polar molecule with strong hydrogen bonding and dipole-dipole forces between molecules.
Hydrogen bonding is a particularly strong intermolecular force because it involves the attraction between a hydrogen atom and an electronegative atom such as oxygen or nitrogen. In methanol, hydrogen bonding leads to strong intermolecular forces which require more energy to overcome, resulting in a higher boiling point. In contrast, hexane has only weak London dispersion forces, which are much less strong than hydrogen bonding, leading to a lower boiling point.
To learn more about methanol refer to:
brainly.com/question/24077457
#SPJ4
Actually, methanol has a higher boiling point than hexane. Methanol has a boiling point of 64.7°C while hexane has a boiling point of 69°C.
The reason for this difference is due to the intermolecular forces between the molecules. Methanol is a polar molecule, which means it has a positive and negative end due to the difference in electronegativity between carbon and oxygen. This allows methanol molecules to form hydrogen bonds with each other, which are stronger intermolecular forces than the London dispersion forces present in nonpolar molecules like hexane. Therefore, methanol requires more energy to break the hydrogen bonds between its molecules, which results in a higher boiling point than hexane.
To learn more about boiling point visit;
https://brainly.com/question/2153588
#SPJ4
which of the following is not an attribute of an acid? group of answer choices it provides h ions in aqueous solution. it tastes sour. it reacts with some organic dyes to cause them to change color. it is a nonelectrolyte. it reacts with active metals.
It is a non-electrolyte is not an attribute of an acid.
What are Acids?
Acids are characterized as materials that can discharge hydrogen particles when they break up in a water-based solution. An acidic solution is one that contains more hydrogen particles, H+ than hydroxide particles, OH-. Acids have a pH value of less than 7.0.
The strength of the acid is determined by the concentration of hydrogen ions, H+.
It provides H+ ions in aqueous solution. It tastes sour. It reacts with some organic dyes to cause them to change color.It is a non-electrolyte. It reacts with active metals.When acids are mixed with a base, they react to produce a salt and water. Acidic solutions have a sour taste and can dissolve metals. Acids turn blue litmus paper red. Acids are used in numerous industrial applications, such as the production of fertilizers, plastics, and dyes, as well as the production of fuels from oil and gas.
They are employed in numerous chemical reactions and cleaning operations. They are widely used in the food industry as a preservative and to add flavor. They are also utilized in medicine to make supplements and for the treatment of diseases.
Thus, it is a non-electrolyte is not an attribute of an acid.
Learn more about acids on:
https://brainly.com/question/25148363
#SPJ11
a crystal of green dye is added to a beaker of water. explain what will happen to the crystal of green dye. define diffusion and state the ultimate outcome of diffusion
A tumbler of water is mixed with a crystalline of green dye. There will be spread of the dye. Diffusion refers to the method of a substance spreading, which is shown by viewing the row of beakers spanning left to right.
Osmosis definition: what does this standardized testing mean?According to its official definition, osmosis is the process by which water diffuses across a membrane in order to move from an area with a high hydraulic conductivity (low solute concentrations) to one with a low potential for water (high solute concentration).
What mechanism explains how the colours permeated the liquid?When we put a drop of dye to a gelatin or gelatin plate at a certain location, it will eventually spread across the surface as the dye molecules are randomly migrating from their initial place in the gel. This is how we may detect diffusional movement using dyes.
To know more about beakers visit:
https://brainly.com/question/29475799
#SPJ1
a gaseous system undergoes a change in temperature and volume. what is the entropy change for a particle in this system if the final number of microstates is 0.418 times that of the initial number of microstates?
The entropy change for a particle in this gaseous system is negative and given by -k ln(2.404). This means that the system becomes less disordered as a result of the change in temperature and volume.
The entropy change for a particle in this gaseous system can be calculated using the Boltzmann entropy formula:
S = k ln(W)
where S is the entropy, k is the Boltzmann constant, and W is the number of microstates.
Since the final number of microstates is 0.418 times that of the initial number of microstates, we can write:
W_final = 0.418 * W_initial
Taking the natural logarithm of both sides, we get:
ln(W_final) = ln(0.418) + ln(W_initial)
Substituting this into the entropy formula, we have:
S_final - S_initial = k ln(W_final) - k ln(W_initial)
= k [ln(0.418) + ln(W_initial)] - k ln(W_initial)
= - k ln(2.404)
Therefore, the entropy change for a particle in this gaseous system is negative and given by -k ln(2.404). This means that the system becomes less disordered as a result of the change in temperature and volume.
Learn more about entropy on:
https://brainly.com/question/419265
#SPJ11
How many atoms are in 3 Na2SO4?
Explanation:
you can count it by looking at the type of element
Based on the relationships between molecular weight, moles, and mass of the substance, how many moles are in 40.0 grams of water? molecular weight of water is equal to 18.1 g/mol. a) 2.21 moles b) 4.42 moles c) 3,45 moles d) 2.53 moles
Answer: 2.22 moles
Explanation:
Molar mass
The molar mass of water, or H2O, can be found by adding the molar mass of two hydrogen atoms and the molar mass of one oxygen atom, which comes out to be 18.0 g/mol.
To find the moles in 40.0 grams of water, we will set up a proportion.
[tex]\frac{18.0 g}{1 mol} =\frac{40.0g}{xmol} \\[/tex]
Then, we just solve for x.
[tex]18=\frac{40}{x} \\x=\frac{40}{18} \\x=2.22 mol[/tex]
40.0 g of water is 2.22 moles.
Each value below represents a different aqueous solution at 25 °C. Classify each solution as acidic, basic, neutral.
* pH = 1.77
* [OH^-] = 4.9 x 10^-5
* pOH = 5.14
* [H^+] = 1.0 x 10^-7
* [H^+0 = 1.9 x 10^-5
* pOH = 7.00
* pH = 9.06
* [H^+] = 5.0 x 10^-10
* pOH = 13.53
* [OH^-] = 4.6 x 10^-12
pH = 1.77 = acidic
* [OH^-] = 4.9 x 10^-5 =basic
* pOH = 5.14 = basic
* [H^+] = 1.0 x 10^-7 = neutral
* [H^+0 = 1.9 x 10^-5 =acidic
* pOH = 7.00 = neutral
* pH = 9.06 = basic
* [H^+] = 5.0 x 10^-10 = acidic
* pOH = 13.53 = acidic.
* [OH^-] = 4.6 x 10^-12 = basic
What happens after a helium flash?
O the core quickly heats up and expandsO the star breaks apart in a violent explosionsO the core suddenly contractsO the core stops fusing helium
After a helium flash, which occurs in the core of a star during the later stages of its evolution, the star enters a stable phase of helium burning. During the flash, helium ignites explosively, producing a burst of energy that causes the core to expand and cool.
However, once the temperature and pressure in the core have reached the required levels again, helium burning resumes, producing energy and keeping the star stable. This process continues until the star exhausts its helium fuel, at which point it may undergo further nuclear reactions or collapse, depending on its mass. The helium flash is a crucial stage in the evolution of low- to medium-mass stars, allowing them to continue burning and shining for billions of years.
Find more about Helium flash
brainly.com/question/31115743
#SPJ4
400.0 g of a metal absorbs 10000. j of heat energy and its temperature rises from 20.0 ºc to 103.0 ºc. what is the specific heat of the metal?
a. 0.301 J/g˚C
b. 0.255 J/g˚C
c.3.32 J/g˚C
d. 0.243 J/g˚C
Specific heat of the metal is approximately 0.301 J/gºC (option a).
Let's discuss it further below.
The specific heat of the metal can be calculated using the formula:
q = mcΔT
where q is the heat absorbed (10000 J), m is the mass of the metal (400 g), c is the specific heat, and ΔT is the change in temperature (103.0 ºC - 20.0 ºC).
Step 1: Calculate ΔT:
ΔT = 103.0 ºC - 20.0 ºC = 83.0 ºC
Step 2: Rearrange the formula to solve for c:
c = q / (mΔT)
Step 3: Plug in the given values and solve for c:
c = 10000 J / (400 g * 83.0 ºC) = 10000 J / 33200 gºC ≈ 0.301 J/gºC
So, the specific heat of the metal is approximately 0.301 J/gºC (option a).
Learn more about specific heat.
brainly.com/question/11297584
#SPJ11
hich type of light can be broken into its individual wavelengths by a prism? a. infrared b. ultraviolet c. combination d. incandescent
The type of light that can be broken into its individual wavelengths by a prism is Ultraviolet. The correct answer is Option B.
What is ultraviolet light?Ultraviolet (UV) light is a form of electromagnetic radiation that is invisible to the eye. Ultraviolet radiation has a wavelength that is shorter than visible light but longer than X-rays. This is the type of light that can be broken down into its individual wavelengths by a prism.
How does a prism work?A prism is a piece of glass or other transparent material with a specific shape that can split white light into its component colors. The process of bending and separating light is known as dispersion. The index of refraction of the glass, as well as the angle of incidence, determines the amount of refraction that occurs.
In conclusion, ultraviolet light is the type of light that can be broken down into its individual wavelengths by a prism.
Learn more about Ultraviolet (UV) here: https://brainly.com/question/23342892
#SPJ11
Water-cooled West condensers are typically used to condense solvent vapors while heating reactions under reflux. Select the proper inlet port for the coolant water O Either port is acceptable to use as the inlet port. The bottom port is the proper inlet The top port is the proper inlet. Water should be introduced into the condenser through both ports simultaneously
The proper inlet port for the coolant water in a water-cooled West condenser is the bottom port.
What is a water-cooled West condenser?A water-cooled West condenser is a device used to cool and condense solvent vapors during the process of heating reactions under reflux. This type of condenser is equipped with two ports for the inlet and outlet of coolant water. It has a glass outer tube and an inner tube made of either glass or PTFE (Polytetrafluoroethylene). The space between the two tubes is where the coolant water flows. This arrangement of tubes creates a space for the vapor to be cooled before it is condensed by the coolant water.
The proper inlet port for the coolant water in a water-cooled West condenser is the bottom port. This is because the coolant water flows from the bottom up towards the top. Therefore, introducing the coolant water into the bottom port will ensure that the water is flowing in the correct direction. In addition, the top port serves as the outlet port for the coolant water, allowing it to flow out of the condenser after it has absorbed the heat from the solvent vapors.
Learn more about water-cooled condenser here: https://brainly.com/question/29588006
#SPJ11
write the net chemical equation for the production of hydrogen from propane and water. be sure your equation is balanced.
The net chemical equation for the production of hydrogen from propane and water is:
[tex]C_{3}H_{8}+3H_{2}O -- > 4H_{2}+3CO_{2}[/tex]
The reaction between propane and water can be used to produce hydrogen gas. The production of hydrogen gas from propane and water is an important reaction that has several applications. The balanced equation for the production of hydrogen gas from propane and water is given as follows:
[tex]C_{3}H_{8} +3H_{2}O-- > 4H_{2}+3CO_{2}[/tex]
The reaction between propane and water can be catalyzed by several metals such as nickel or platinum. The process is called steam reforming, and it is used to produce large quantities of hydrogen gas. Hydrogen is used as a fuel in fuel cells and combustion engines. It is also used in the production of ammonia and methanol, and as a reducing agent in various chemical processes.
To learn more about "chemical equation", visit: https://brainly.com/question/11231920
#SPJ11
A runner is finishing up the last leg of a 5K run. Identify and explain which organelle(s) would be heavily involved in providing the runner’s cells with energy.
The organelle heavily involved in providing runner's cells with energy during the last leg of a 5K run is the mitochondria
Which organelle would be heavily involved in providing runner’s cells with energy ?The organelle heavily involved in providing the runner's cells with energy during the last leg of a 5K run is the mitochondria. Mitochondria are referred to as the "powerhouses" of the cell because they are responsible for producing the energy currency of cell, ATP (adenosine triphosphate), through the process of cellular respiration. During exercise, demand for ATP increases, and mitochondria works harder to meet this demand by breaking down glucose and other fuel molecules to generate ATP. Therefore, runner's cells would require a high level of mitochondrial activity to provide them with energy needed to complete the run.
To know more about mitochondria, refer
https://brainly.com/question/869305
#SPJ1
why do chemists use molarity to express concentration of solutions
Chemists use molarity to express concentration of solutions because it is convenient to determine molar concentration which helps us to find volume of the solution and weight of the solute.
Because it is simple and practical to apply, chemists express the concentration of solutions using molarity. It is possible to weigh the solute in grammes, convert its weight to moles, and combine it with a volume. The total molar concentration is equal to the molar concentrations added together.
Molarity is calculated as the number of moles of solute divided by the volume of the solution, and the volume of a solution depends on its density, which is a function of temperature.
Molarity = number of moles (n) / volume (L)
Due to its close association to moles, a term that connects the bulk measurement of substances to the microscopic and symbolic representations of chemistry, molarity is particularly beneficial to chemists.
To know more about molarity, refer:
https://brainly.com/question/21497047
#SPJ4
according to the ph scale, which of these substances is the strongest acid?
According to the pH scale, Option A) battery acid is the most strongest acid among all the substances mentioned.
The pH scale measures the acidity or basicity of a substance. It ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity, with lower values indicating stronger acidity. Values above 7 indicate basicity, with higher values indicating stronger basicity. The scale is logarithmic, meaning that each whole number change represents a tenfold change in acidity or basicity. For example, a substance with a pH of 4 is ten times more acidic than one with a pH of 5.
Learn more about pH scale here: brainly.com/question/1433865
#SPJ4
Complete question:
According to the pH scale, which of these substances is the strongest acid?
A) Battery acid
B) Lemon juice
C) Vinegar
D) Tomato juice
E) Black coffee
F) Milk
someone do it and tell me what to put in the boxes
In a liquid state, where they have greater energy, water molecules travel more swiftly and essentially bounce against one another than they do in a solid form. When the liquid cools, potential energy diminishes.
How does energy change when water freezes?During freezing, a substance's temperature stays constant while the liquid's dissolved particles transform into crystalline solids. Energy escapes during freezing because liquid particles have more energy then particles in a solid. The environment receives this energy's discharge.
Can ice water possess energy?Gas molecules are far more energetic and disperse than liquid molecules do. Since warm water has much more energy that cold water, warm water molecules travel more quickly than cold water molecules.
To know more about liquid visit:
https://brainly.com/question/20922015
#SPJ1
How many milliliters (mL) of a 0.610 M NaOH solution are needed to neutralize20.0
mL of a 0.245 M H2SO4solution?
16 mL of 0.610 M NaOH solution is required to neutralize 20.0 mL of 0.245 M H2SO4 solution.
What is meant by neutralization?Chemical reaction between acid and a base that results in the formation of a salt and water is called neutralization.
2 NaOH+ H₂SO₄ → Na₂SO₄ + 2 H₂O
Number of moles of H₂SO₄ in 20.0 mL of a 0.245 M solution is: n( H₂SO₄) = M × V = 0.245 mol/L × 20.0 mL / 1000 mL/L = 0.0049 mol
n(NaOH) = 2 × n( H₂SO₄) = 2 × 0.0049 mol = 0.0098 mol
V(NaOH) = n(NaOH) / M(NaOH) = 0.0098 mol / 0.610 mol/L = 0.016 m³ = 16 mL
Therefore, we need 16 mL of the 0.610 M NaOH solution to neutralize 20.0 mL of the 0.245 M H₂SO₄ solution.
To know more about neutralization, refer
https://brainly.com/question/23008798
#SPJ1
How many grams of O₂ are present in having 3x10²3 a container, molecules? (Atomic mass O=16)
Answer:
16g
Explanation:
1 mole of O2 = 32 g = 6.022 x 10^23 molecules
3 x 10^23 molecules weights
3 x 10^23 x 32/(6.022 x 10^23)
= 15.94g or 16g
What are 5 names for added sugars?
Added sugars are various types of sugars and syrups that are added to food products during processing . Here are five common names for added sugars: Sucrose, Dextrose, Fructose, Maltose, High fructose corn syrup .
Sucrose: it is a disaccharide made up of glucose and fructose .
High fructose corn syrup: a sweetener made from cornstarch that has been processed to convert some of its glucose into fructose.
Dextrose: a simple sugar that is chemically identical to glucose and is commonly used in processed foods.
Fructose: a simple sugar found naturally in fruits, vegetables, and honey.
Maltose: a disaccharide made up of two glucose molecules and is commonly used as a sweetener in some beers and candies.
To know more about Added sugars, here
brainly.com/question/14570544
#SPJ4
if the a of a monoprotic weak acid is 8.4×10−6, what is the ph of a 0.38 m solution of this acid?
To find the pH of a 0.38 M solution of a weak acid with a given acid dissociation constant (Ka), we can use the following formula:
Ka = [H+][A-]/[HA]
where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.
First, we need to find the concentration of the conjugate base (A-) in the solution. This can be done using the following formula:
[A-] = [HA] * (Ka / [H+])
Plugging in the values given in the problem, we get:
[A-] = 0.38 * (8.4×10−6 / [H+])
Next, we can use the law of mass action to find the concentration of hydrogen ions in the solution:
Ka = [H+] * [A-] / [HA]
Plugging in the values we just found, we get:
8.4×10−6 = [H+]^2 / (0.38 * [H+])
Solving for [H+], we get:
[H+] = 1.0×10^-3 M
Finally, we can use the formula for pH to find the pH of the solution:
pH = -log([H+])
Plugging in the value we just found, we get:
pH = -log(1.0×10^-3) = 3.00
Therefore, the pH of a 0.38 M solution of a monoprotic weak acid with a Ka of 8.4×10−6 is approximately 3.00.
For more questions like a weak acid, visit the link below:
https://brainly.com/question/10702500
#SPJ11