Answer:
Titration is a procedure in which a solution is called the titrant. Whose concentration is known very accurately is dispensed by a burette and reacted with a known volume of another solution of unknown concentration is called the analyte. By measuring the amount of titrant needed to neutralize the analyte, you can determine the concentration of the analyte very accurately.The "end point" of a titration is the point at which the titration is complete, typically when an added indicator solution such as phenolphthalein changes color. The "equivalence point" is closely related to but not necessarily identical with the end point. The equivalence point is the point at which the number of moles (or equivalents) of titrant exactly equals the number of moles (or equivalents) of analyte.Ideally, the end point should exactly equal the equivalence point, but in the real world they are slightly different.
For example, titrate a hydrochloric acid analyte with a sodium hydroxide titrant, using phenolphthalein as an indicator. Phenolphthalein is colorless in acid solutions, and pink in base solutions, but no color change occurs until the pH of the solution reaches about 8.2, well into the basic range.
Titration is a laboratory technique used to determine the concentration of a substance in a solution.
It involves a controlled chemical reaction between a known volume of a solution with a known concentration (the titrant) and the solution with an unknown concentration (the analyte). The process is typically used in acid-base reactions or for various other types of chemical analyses.
Here's a brief overview of the titration process:
Preparation: The solution with the unknown concentration (analyte) is placed in a titration flask, and a few drops of an indicator (a chemical that changes color depending on the pH of the solution) are added to the analyte. The titrant, a solution with a known concentration, is filled in a burette.
Slow addition: The titrant is added slowly from the burette to the analyte solution in the flask. The mixture is swirled gently to ensure proper mixing.
Endpoint detection: The indicator's color change signals the completion of the reaction between the analyte and titrant. This point is called the endpoint. For example, in an acid-base titration, the endpoint is often reached when the solution changes color due to the neutralization reaction.
Volume measurement: The volume of the titrant used to reach the endpoint is recorded. The volume is typically measured with high precision since it is used to calculate the unknown concentration of the analyte.
Calculation: Using stoichiometry and the volume of titrant used, the unknown concentration of the analyte can be determined.
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According to LOCO mass, the mass of reactants and products are what?
Answer:
Equal
Explanation:
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Can someone please help me? :(
Answer:
I think c is the right answer
SCIENCE WHICH IS CORRECT?
Downy Woodpecker
Explanation:Reading and Annotating the Question
One way to narrow the choices is to read the question first. While reading the question, annotate for important phrases. I would underline "dead branches and dying trees" and "habit would be most affected."
Reading and Annotating the Chart
Now that we have read the question, it is time to read the chart. While you read, check for words or phrases that relate to the phrases we underlined in the question. When I read the chart I noticed the phrase "decaying trees" under the Downy Woodpecker. Since the Downy Woodpecker depends on decaying trees, they would be heavily affected by the removal of dying trees.
Process of Elimination
To check our answer we can use the process of elimination.
A) We can eliminate the Baltimore Oriole because it relies on "tall trees," not dying trees.
B) The Barn Swallow is also incorrect because they nest "under roofs," which is not affected by the removal of any trees.
D) Finally, the Belted Kingfisher is wrong because they build nests in "tunnels or burrows," which is also unrelated to the removal of trees.
This precipitation fell
as freezing rain.
Which of the
following BEST
describes why this
precipitation did not
fall as snow?
A. the air above the ground was too cold to support
snowfall
B. the precipitation obviously fell directly from the
clouds as icicles
C. the air above the ground was above freezing, the
surfaces on the ground were below freezing
D. there were no clouds above the ground so the
precipitation bubbled up out of the frozen ground by
Precipitation is the fall of the condensed product to the ground. The freezing rain occurred because the air above the ground was above freezing.
What is freezing rain?
Freezing rain is the form of precipitation that occurs when the rain droplets freeze upon contacting the ground surfaces. It is composed entirely of liquid water droplets.
Freezing rain occurred because there was not enough time for the water to freeze in a cloud, unlike the snow. Snow is another type of precipitation that forms when the temperature is low in the atmospheric surroundings.
Therefore, option C. the air above the ground surface was above freezing level explains the formation of freezing rain.
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Molecules that do not ____________ (or come apart) in solution are called ____________ . Most of these substances are covalently bonded ____________ (e.g., glucose, urea, and creatinine). In contrast, a(n) ____________ is any substance that dissociates in solution to form _
Filling in the gaps in the excerpt below
Molecules that do not __Dissociate__________ (or come apart) in solution are called ___Non-electrolyte substances_________ . Most of these substances are covalently bonded __and do not conduct electricity__________ (e.g., glucose, urea, and creatinine). In contrast, a(n) ___Electrolyte_________ is any substance that dissociates in solution to form Salts
Difference between electrolytes and Non-electrolytesElectrolytes are substances that conduct electricity because they readily ionize when placed in a solution. while Non-electrolytes do not readily conduct electricity because they do not dissociate into ions when placed in a solution.
Hence we can conclude that the answers to your questions are as listed above.
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18. 0mols of sodium reacts with excess chlorine. How many
grams of sodium chloride form?
please help
Answer:
I think the answer is 0 because 0 mols of sodium react
Explanation:
Which factor does not affect the rate of solubility?.
A solution has [H3O+] = 2.8x10-5 M. Use the ion product constant of water K. = [H30 - ) [OH-] to find the [OH-] of the solution. Express your answer to two significant figures.
Answer:
Approximately [tex]3.6 \times 10^{-10}\; {\rm M}[/tex], assuming that the solution is dilute and is at room temperature (such that [tex]K_\text{w} = 10^{-14}[/tex].)
Explanation:
Look up the ion product constant of water:
[tex]K_{\text{w}} \approx 10^{-14}[/tex].
In a dilute solution where water is the solvent, the product of [tex][{\rm {H_{3}O}^{+}}][/tex] and [tex][{\rm {OH}^{-}}][/tex] (concentration of [tex]\rm {H_{3}O}^{+}}[/tex] ions and [tex]{\rm {OH}^{-}}[/tex] ions) is constantly equal to [tex]K_{\text{w}}[/tex]. (The unit of both [tex][{\rm {H_{3}O}^{+}}]\![/tex] and [tex][{\rm {OH}^{-}}]\![/tex] need to be [tex]{\rm M}[/tex].) In other words:
[tex][{\rm {H_{3}O}^{+}}]\, [{\rm {OH}^{-}}] = K_{\text{w}}[/tex].
Rearrange this equation to find [tex][{\rm {OH}^{-}}][/tex] in terms of [tex]K_{\text{w}}[/tex] and [tex][{\rm {H_{3}O}^{+}}][/tex]:
[tex]\begin{aligned}[] [ {\rm OH^{-}} ] &= \frac{K_{\text{w}}}{[{\rm {H_{3}O}^{+}}]} \\ &= \frac{10^{-14}}{2.8 \times 10^{-5}} \\ &\approx 3.6 \times 10^{-10}\end{aligned}[/tex].
A student measured and recorded the temperature of the liquid
inside a can of carbonated soft drink. He then poured the soft
drink from the can into a glass filled with ice. Gas bubbles
appeared on the sides of the glass and formed a layer of foam
as they rose to the top of the glass. The mixture gave off a sweet
odor. When the temperature of the soft drink and ice mixture
was measured, the temperature of the mixture was much lower
than the temperature previously recorded for the canned soft
drink. The student concluded a chemical change had taken
place.
Which statement provides the best evidence that the student's
conclusion is wrong?
Gas bubbles
appeared on the
sides of the glass.
No new substances
were formed.
There was a change
in temperature.
The mixture gave off
a sweet odor.
There is the change in temperature is the correct answer.
What is a carbonated soft drink?Carbonated beverages are drinks that include carbon dioxide dissolved in water.
It is given as the formation of bubbles and the odour will be concluding with the formation of the new product and thereby a chemical change. Whereas there was no chemical change if the temperature lowers down as the reason stands to be the formation of a mixture.
Hence, there is a change in temperature.
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A solution of rubbing alcohol is 68.4 % (v/v) isopropanol in water. How many milliliters of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution
Taking into account the definition of Volume to Volume Percentage (% V/V), 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
Volume to Volume Percentage (% V/V)Volume to Volume Percentage (% V/V) is a measure of concentration that indicates the volume of solute per 100 volume units of solution.
In other words, the percentage %v/v indicates the volume of solute (in mL) that is dissolved in 100 mL of solution.
The %v/v of a solution is determined by the following expression, which is multiplied by 100 to express it as a percentage:
[tex]v/v=\frac{volume of solute (mL)}{volume of solution(mL)} x100[/tex]
Volume of isopropanol in the sampleIn this case, you know:
%v/v= 68.4 %volume of solute= ?volume of solution= 89.7 mLReplacing in the definition of %v/v:
[tex]68.4=\frac{volume of solute (mL)}{89.7 mL} x100[/tex]
Solving:
volume of solute= (68.4× 89.7 mL)÷ 100
volume of solute= 61.3548 mL
Finally, 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.
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How many spaces away from a Noble gas are the following elements?
a. Na, Li, K and Cs?
Answer:
Na - 1 away from neon
Li - 1 away from helium
K - 1 away from argon
Cs - 1 away from xenon
Explanation:
We see this trend as group 1A elements are 1 away from noble gases and hence, have a valency of 1
How many moles are there of a 2 M solution with a volume of 17.95 liters?
Answer:How many moles are there of a 2 M solution with a volume of 17.95 liters = 35.9 moles !
Explanation: The formula for calculating the molarity of the solution is expressed as Molarity= mole/volume
Molarity = 2 M
Volume=17.95L
Substitute the given parameters into the formula … and you get
mole=molarity x volume
Mole=2M x 17.95L
Mole=35.9moles
moles of the solution is 35.9 moles
Hope this helps if so mark Brainalist thanks
Which of the following minerals effervesces (produces a bubbling, fizzing reaction) in hydrochloric acid? Group of answer choices gypsum quartz halite calcite
The minerals effervesce (produces a bubbling, fizzing reaction) in hydrochloric acid is calcite. The correct option is D, calcite.
What is calcite?Calcite is a mineral that is very hard, and highly reactive.
It is present in many colors, white, yellow, orange, red, green, and blue.
In Ancient Egypt, calcite was used to carve many things, such as bast, alabaster, etc.
Thus, the correct option is D, calcite.
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A mother and two young children are found passed out in their apartment, where a space heater is on. Emergency medical technicians suspect carbon monoxide poisoning. Why is carbon monoxide dangerous
Answer:
ummm a I guess if I am wrong tell me
What laws do astronomers use to indirectly learn about stars?
Answer
Laws that are used by astronomers to learn about stars indirectly are as given below:-
Kirchhoff's First LawCassini's laws
What is the concentration of an aqueous solution with a volume of
550 mL that contains 350 grams of iron (II) chloride (FeCl2)?
Answer:
Explanation:
The formula for concentration is C = n/V
Where C represents concentration in mol/L.
n represents moles in mol.
V respresents volume in L.
You have 550 mL, let's convert it to L (1000 mL= 1L)
550 mL / 1000 = 0.55 L
We got V and we need n. We can find n by this formula:
n = m/M
m represents mass in g.
M represents molar mass in g/mol.
We are given grams of iron (II) chloride (FeCl2)
Find the molar mass by the periodic table: 55.85 + (2*35.45) = 126.75 g/mol.
n = (350 g) / (126.75 g/mol) = 2.76134 mol
Back to our first formula: C = n / V
C = (2.76134 mol) / (0.55 L) = 5.0206 mol/L.
to 3 significant digits it's 5.02 mol/L, and that is how you find concentration.
A sample of nitrogen gas reacts with an excess of hydrogen gas to give an actual yield of 20.05 g NH3. The theoretical yield is 26.46g.
What is the percent yield for this reaction?
Round to two decimal places
N2(g) + 3H2(g)+2 NH3 (g)
Answer: 75.77%
Explanation:
Percent yield = (actual yield)/(theoretical yield) = 20.05 / 26.46 * 100 = 75.77%
What is the importance of antacid in the body?
Answer:
The substances which neutralize the acids of the stomach are called antacids. Acidity in the stomach causes the sensation of heartburn, antacids are taken to relieve this sensation. They are taken orally to suppress the effects of acidity.
hydration and solvation which the solvent is water. what is solvation?
Answer:
Solvation is the interaction of a solvent with the dissolved solute—in the case of water, solvation is often referred to as hydration. Solvent polarity is the most important factor in determining how well it solvates a particular solute.
Explanation:
hope this helps :)
Hydrazine (N_2H_4) decomposes to produce N_2 and NH_3. How many molecules of NH_3 will be formed if 60 molecules of N_2H_4 decompose into N_2 and NH_3
80 molecules of [tex]NH_{3}[/tex] will be formed if 60 molecules of [tex]N_{2}H_{4}[/tex] decomposes into [tex]N_{2}[/tex] and [tex]NH_{3}[/tex]
What are molecules?The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.
Just balance the reaction:
[tex]3N_{2}H_{4}\to N_{2}+4NH_{3}[/tex]
Now you can see that every 3 molecules of [tex]N_{2}H_{4}[/tex]4 molecules of [tex]NH_{3}[/tex].
For 60molecules of [tex]N_{2}H_{4}[/tex] we scale up these numbers by a factor of 60/3 = 20.
Therefore 4x20 = 80 molecules of [tex]NH_{3}[/tex] are formed.
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Copper(II) sulfate is an example of a substance that dissolves in water. Copper(II) sulfate is an ionic compound with the chemical formula CuSO4 and when it is added to water it dissociates into Cu2+ and SO42− ions. Students used both copper sulfate crystals and copper sulfate powder in this experiment on the rate of dissolving. Choose one statement that represents a valid conclusion based on the student data?
A) The smaller the solute particles the more energy they have. Increased energy results in shorted dissolving time.
B) A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
C) As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
D) Agitation of the powder allows fresh solvent molecules to continually be in contact with the solute
As the water temperature increased, the copper sulfate crystals dissolved faster but there was little change for the powdered form.
Does increase in temperature make solids to dissolve faster?Increasing the temperature of a solvent can increase the rate at which a solid dissolves. This is because an increase in temperature causes the solvent molecules to move more rapidly, which in turn increases their kinetic energy and ability to interact with the solute particles.
As a result, the solute particles are more likely to break free from their crystal lattice and become surrounded by the solvent molecules.
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Answer:
A given quantity of solute dissolves faster when it is ground into small particles because more surface area is exposed.
Explanation:
The more surface area of a solute that is exposed, the faster the solute will dissolve. Like sugar for an example, sugar cubes take longer to dissolve as compared to regular ground up sugar.
And I took the test and got this right!
please help smart kids HHowhotwill a 2.3 L balloon have to get to expand to a volume of 400 L? Assume that the initial temperature of the balloon is 25 degrees C.
Answer:
51 579 C
Explanation:
I will assume the PRESSURE remains constant
then
V1 /T1 = V2/T2 T will be in Kelvin
25 C = 298.15 K
2.3 l / 298.15 K = 400 l / T2
solve for T2 = 51852.17 K = 51579 C
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What is one thing that could have prevented the Chernobyl tragedy?
Answer: if the staff at Chernobyl had been better trained.
The Chernobyl series seems to suggest there were a number of ways the explosion could have been prevented. These include if the staff at Chernobyl had been better trained, if the Soviet government had learned from the lessons of the past and if they had not been so averse to spending money.
Ocean salinity will vary with evaporation as well as with freezing and thawing. True or False?
True
False
Answer: true
Explanation:
Ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
What is Ocean salinity?Salinity, commonly known as saline water (also see soil salinity), is the degree of saltiness or the quantity of salt dispersed throughout a body of water. The standard units of measurement are grammes of salt per litre (g/L) or grammes per kilogramme (g/kg; the latter one is dimensionless therefore equal to ).
Salinity is a thermodynamic condition variable that, along with pressure and temperature, controls physical properties like the density also heat capacity of the water. Salinity plays a significant role in defining numerous facets of the chemical composition of natural waters as well as the biological processes within them. Ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
Therefore, ocean salinity will vary with evaporation as well as with freezing and thawing. this statement is true.
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Which enzyme of the citric acid cycle most closely resembles the pyruvate dehydrogenase complex in terms of its structure, organization, and the reaction it performs
Answer:
The α-ketoglutarate dehydrogenase enzyme is structurally and functionally homologous to the pyruvate dehydrogenase complex.
hope it helps
A balloon contains 7. 2 L of helium. The pressure is reduced to 2. 00 atm and the balloon expands to occupy a volume of 25. 1 L. What was the initial pressure exerted on the balloon?
Answer:
your answer should be 0.57 atm
Can someone please help me? :(
nuclear energy, once used up it can not be used again
What is the power of a food processor that can perform 1,350 joules of work in 15 seconds
which pH would react more vigorously with zinc carbonate
What mass of Ca(OH)2 is contained in 1500 mL of 0.0250 M Ca(OH)2 solution?
Your answer:
1.85 g
2.34 g
2.78 g
3.17 g
We need moles of Ca(OH)_2
Molarity=Moles/Volume in L0.025=Moles/1.5Moles=1.5(0.025)Moles=0.0375molMolar mass of Ca(OH)_2=74g/mol
Now
Mass=Molar mass×MolesMass=0.0375×74Mass=2.77gOption C
The mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.
Given: Volume = 1500 mL, Concentration (Molarity) = 0.0250 M, and Compound = Ca(OH)₂ .
First, convert mL to L: Volume = 1500 mL × (1 L / 1000 mL) = 1.5 L.
Use the formula for calculating the number of moles: Moles = Concentration × Volume.
Moles = 0.0250 mol/L × 1.5 L = 0.0375 mol.
The molar mass of Ca(OH)₂ can be calculated:
Ca(OH)₂ molar mass = (1 * atomic mass of Ca) + (2 * atomic mass of O) + (2 * atomic mass of H)
= (1 * 40.08 g/mol) + (2 * 16.00 g/mol) + (2 * 1.01 g/mol)
= 74.09 g/mol.
Now, calculate the mass using the calculated moles and molar mass:
Mass = Moles × Molar mass
Mass = 0.0375 mol × 74.09 g/mol = 2.78 g.
Therefore, the mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.
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The complete question is:
What mass of Ca(OH)₂ is contained in 1500 mL of 0.0250 M Ca(OH)₂ solution?
A) 1.85 g
B) 2.34 g
C) 2.78 g
D) 3.17 g