How many moles of sodium acetate must be added to 500.0 mL of 0.250 M acetic acid solution to produce a solution with a pH of 4.94? (The pKa of acetic acid is 4.74)A) 0.011 molesB) 0.021 molesC) 0.13 molD) 0.20 molE) 0.21 mol

Answers

Answer 1

To produce a solution with a pH of 4.94, a certain amount of sodium acetate should be added to a 500.0 mL 0.250 M acetic acid solution. The correct amount is (A) 0.011 moles.

First, we need to use the Henderson-Hasselbalch equation to find the ratio of[tex]\frac{{[\text{{acetate}}]}}{{[\text{{acetic acid}}]}}[/tex]required to produce a solution with pH 4.94.

[tex]pH = pKa + log \left( \frac{{[Acetate]}}{{[Acetic Acid]}} \right)[/tex]

4.94 = 4.74 + log([acetate]/[acetic acid])

[tex]0.2 = \log \left( \frac{{[\text{{acetate}}]}}{{[\text{{acetic acid}}]}} \right)[/tex]

[tex]\frac{{[\text{{acetate}}]}}{{[\text{{acetic acid}}]}} = 10^{0.2} = 1.585[/tex]

We want to add enough sodium acetate to produce a 0.250 M solution, so we can set up the following equation:

[tex]0.250 \, \text{M} = \frac{{[\text{acetate}] + [\text{acetic acid}]}}{{0.5 \, \text{L}}}[/tex]

Since [acetate]/[acetic acid] = 1.585, we can substitute and simplify:

[tex]0.250 \, \text{M} = \frac{{[\text{acetic acid}] \cdot (1 + 1.585)}}{{0.5 \, \text{L}}}[/tex]

[acetic acid] = 0.105 M

To find the amount of acetic acid required, we can use the following equation:

moles = M x V (where V is in liters)

moles acetic acid = 0.105 M x 0.500 L = 0.0525 moles

Since sodium acetate is a 1:1 electrolyte, we need to add the same amount of moles of sodium acetate as acetic acid:

moles sodium acetate = 0.0525 moles

Therefore, the answer is A) 0.011 moles.

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Related Questions

which of the following is and example of a chemical property?

Answers

A-reactivity with oxygen

Consider the data [X] [Y] [Z] initial rate M M M M · s −1 Exp 1 0.30 0.20 0.35 0.210 Exp 2 0.60 0.10 0.70 0.420 Exp 3 0.60 0.20 0.70 0.420 Exp 4 0.60 0.40 0.35 0.105 What is a correct rate law for the reaction?

Answers

Answer:

Rate = k [X]⁻¹ [Z]²

Explanation:

[X] [Y] [Z] initial rate M M M M · s −1

Exp 1 0.30 0.20 0.35      0.210

Exp 2 0.60 0.10 0.70      0.420

Exp 3 0.60 0.20 0.70     0.420

Exp 4 0.60 0.40 0.35      0.105

In Experiment 2 and 3 where the concentrations of Y and Z were constant, doubling the concentration of Y had no effect on the rate of the reaction. This means, that the rate of the reaction is zero order with respect to Y.

In experiment 3 and 4, dividing the concentration of Z by 2, causes the rate of the reaction to decrease by 4. This means the rate of the reaction is second order with respect to Z.

In experiment 1 and 4, doubling the concentration of X, causes the rate of the reaction to decrease by half. This means that X has an order of -1 with respect to the rate of the reaction.

The rate expression is given as;

Rate = k [X]⁻¹[Y]⁰[Z]²

Rate = k [X]⁻¹ [Z]²

6. El oxígeno gaseoso se calienta a presión constate de 50 °C a 300 K. Se conoce que inicialmente el volumen del sistema era de 1,3 litros. ¿Cuál es el volumen final del sistema?

Answers

Answer:

El volumen final del sistema es 1.2L

Explanation:

La ley de Charles establece que el incremento de la temperatura de un gas produce un incremento en el volumen directamente proporcional cuando la presión permanece constante. La ecuación es:

V₁/T₁ = V₂/T₂

Donde V es volumen y T temperatura absoluta de un gas en 1, el estado inicial y 2, su estado final.

Reemplazando:

V₁ = 1.3L

T₁ = 50°C + 273.15K = 323.15K

V₂ = Incógnita

T₂ = 300K

1.3L/323.15K = V₂/300K

1.2L = V₂

El volumen final del sistema es 1.2L

Which of the following is considered a dilute solution? Choose all that apply.
Very sweet tea
Contact lens solution
Tide pods (laundry detergent)
Swimming pool water

Answers

Answer:

Very sweet tea

Explanation:

yeah... because sweet tea can cause tooth decay in our mouth thats why...(Please check the other answers also...Its all my point of view....thank you)

An iron loses electrons. State the type of charge it will end up with


write in your own words

Answers

Answer:

Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic

HELPPPP I NEED TO SEND THEM TO MY TEACHER ITS REACTIONS AND SOME OF THEM MIGHT CANT HAPPEN

Answers

Answer:

Explanation:

follow the rule of "a weak acid can't make a stronger acid and weak base can't make a stronger base(it's pretty accurate for acid/salt reactions/replacemnts)" the last reactions won't work, but the second to last one will be kbr+pb(no3)2-> kno3 + PbBr2 (this is unballanced.) the first reaction will work. the second one i'm not too sure tbh, but i think it won't work since barium hydroxide's a weak base and if it were to react it would make koh, a super strong base

Answer:

3Ba(OH)2 + 2K3PO4 ----> 6KOH + Ba3(PO4)2

2KBr + Pb(NO3)2  ------> 2KNO3 + PbBr2

H3PO4 + 3KCl -----> K3PO4 + 3HCl

Explanation:

Two forms of energy found in all systems are kinetic energy and

Answers

Answer:

Potential energy

Explanation:

Calculate the standard enthalpy of reaction
for the reaction 2 Na (s) + 2 H₂O (l)
2 NaOH (aq) + H₂ (g), Standard enthalpies
formation are -285.8 kJ/mol for H₂O and -470. 11 kJ/mol for NaOH (aq).

Answers

Answer:

-368.62 kJ/mol

Explanation:

[(2 x - 470.11 kJ/mol) ( 0kJ/mol)] - [ 2 x -285.8 kJ/mol) (2x 0 kj/mol)] = -368.62 kJ/mol

What is the mass of a liquid that has a density of 124 g/mL and takes up a volume of 18 mL. What mass should the liquid have? (round you answer to the nearest hundredth)

Answers

the mass of the liquid should have 69

Help please!! I'll name you brainliest!!

Answers

Answer:

MgO

Explanation:

what is the defination of epsom salt?

Answers

crystals of hydrated magnesium sulfate used as a purgative or for other medicinal use


It on googIe
Hope that helps
epsom salt is a crystals of hydrated magnesium sulphate used as a purgative or for other medicinal use.

MARK ME BRAINLIST

Which processes are part of the fast carbon cycle?

Answers

Answer:

Option C

Explanation: Pass me the brainliest I only need 1

Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!​

Answers

Answer:

Nepal is a multilingual, multiethnic, multicultural and multi-religious nation. Unity in diversity is the defining characteristics of Nepali society. Mutual coexistence, tolerance and cooperation have guided the people in achieving social cohesion, peace and happiness.

Explanation:

Please mark as brainliest!

very urgent
1. Describe an experiment to show the chemical effect of electric current.
2. State three conditions necessary for combustion
3. Describe all that you observe when a piece of iron is placed in copper sulphate solution for a
few minutes.​

Answers

Explanation:

STEP 1- Take two iron nails.

STEP 2- Clean it with sand paper.

STEP 3- Wrap copper wire around both the nails. And connect the other end to the battery terminal.

STEP 4- Take water in beaker and little amount of salt in it or a few drpos of sulphuric acid in it.

STEP 5- Immerse the nails in the solution.

STEP 6- Observe the nails carefully. You can see bubbles of gases coming out from water near nails.

When, electeric current is passed through water gases like hydrogen and oxygen are evolved.

2.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.

When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.

What is the measurement between two points known as?

Answers

Answer:

The measurement between to points is known as the distance

Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of

Answers

Erosion is the best anwser for that

What is the meaning of this painting

Answers

Answer: things arnent always as they seem

Explanation:

If you have 3 moles of calcium carbonate, how many grams of calcium bicarbonate are formed?

Answers

Answer:

hhjcioz xlioyudiyyxyisrupautwtritu regards Roy

ahh help, is it true or false?

Answers

I think it’s true, false, false

What is the molarity of a 300.0 mL solution containing 25.0 g of NaCl?

Answers

Answer:

1,43 M

Explanation:

molair mass NaCl = 58,44 g/mol

You need to calculate how many moles 25 g is:

25 g / 58,44 g/mol = 0,4278 mol

0,4278 mol / 0,3 L = 1,43 M

What is the answer to the formula 12+6/2+10?
0 25
O 14
O 19
03.6

Answers

The answer was 25

Do according to bodmas rule

Where is the youngest rock in the Atlantic Ocean found?
plz hurry

Answers

Answer:

Seafloor Ages

They found that the youngest rocks on the seafloor were at the mid-ocean ridges. The rocks get older with distance from the ridge crest.

hope this helped

Tammy spent of her savings on a watch. She then spent-of
the remainder on a
.
5
bag. What fraction of her money did she have left?

Answers

Answer:

1 / 2 of her money would be left

Explanation:

Tammy spent 2/5 of her savings on a watch. She then spent 1/6 of the remainder on a bag. What fraction of her money did she have left?

Taking the question bits by bit;

Tammy spent 2/5 of her savings on a watch

Amount Spent = 2/5

Remainder = 1 - 2/5 = 3/5

She then spent 1/6 of the remainder on a bag

Amount Spent = 1/6  *  3/5 = 1/2  *  1/5  = 1 /10

Total amount spent = 2/5 + 1 /10 =   (4 + 1 ) / 10 = 5 / 10 = 1 / 2

Amount left = 1 - 1 /2 = 1 / 2

SCIENCE
What is it called when two or more elements are brought together?

A. Solution.
B. Mixture.
C. Chemical reaction.

Answers

Answer:

C

chemical reaction .

Answer:

C

Explanation:

Chemical reaction.

Does hydrogen have similar physical properties to alkali metals?

Answers

Answer:

YES

Explanation:

because it contain 1 electron in its outermost shell

When elements are arranged according to increasing atomic number, there is a repeating, regular pattern of properties
This is called

periodic law

group

periodic table

family

Answers

Answer:

grpup

Explanation:

napagaralan namin yan

Clear selection
1 point
5. Choose the correct pair to
complete the given statement.
The size of the pupil _ (i) _ in
bright light to allow _ (ii) _ light
to enter our eyes.
O A. (i) increases and (ii) more
B. (i) decreases and (ii) more
O C. (i) increases and (ii) less
O D. (i) decreases and (ii) less
6. Which labelled part gives the 1 poi
human eye, its characteristic
colour
?​

Answers

Answer:

I believe it is d! Reason being, when you cover your eyes with your hands for a period if time, and then move your hands, your pupils become wide, this means that when there is light your pupils are most like decreasing in size and allowing less light! :) hope this helps

How many carbon (C) atoms are in CaCO3?​

Answers

Answer:one atom

Explanation:

The carbon symbol is C so only one

Calcium has 1 atom

Oxygen has 3 atoms

Answer:

Only one Carbon atom

Explanation:

CaCO3 is composed of one atom of Calcium, one atom of Carbon and three atoms of oxygen

gases are also good conductors of electricity in discharge tube at
1)high pressure high voltage
2) low pressure low voltage
3) low pressure high voltage
4) never
pls help wil marks as brainliest ​

Answers

Answer:

3)low pressure and high voltage

BRAINLIEST IF YOU GET IT!! 5 STARS & A THANK YOU!!
Which of the following is a distinguishing difference between rocks and minerals?
A. Minerals are aggregates of different rocks and elements.
B. Minerals have specific chemical compositions, but rocks do not.
C. Crystals are a type of rock and granite is a type of mineral.
D. Minerals are made of rocks combined in different combinations.

Answers

Answer:

B.

Explanation:

Minerals are formed due to chemical composition by rocks are pressured into their formed from dirt and naturally hard things.

The statement that represents a distinguishing difference between rocks and minerals is as follows:

Minerals have specific chemical compositions, but rocks do not.

Thus, the correct option for this question is B.

What is the difference between rocks and minerals?

A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition, and atomic structure. Rocks are generally made up of two or more minerals, mixed up through geological processes.

Minerals are definitely formed due to chemical composition by rocks being pressured into their formation from dirt and naturally hard things. A rock is an inorganic and a solid naturally-formed substance without any chemical composition or atomic structure.

A mineral is also a solid, inorganic, substance as that like a rock which has a definite crystalline structure as well as chemical composition. Rocks form, break down and move through the rock cycle.

Therefore, the correct option for this question is B.

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