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12 Dec 2019

Calculate the pH of each of the solutions and the change in pH to 0.01 pH units caused by adding 10.0 mL of 3.90-M HCl to 350. mL of each of the following solutions.

Change is defined as final minus initial, so if the pH drops upon mixing the change is negative.

a) water

pH before mixing =
pH after mixing=
pH change =

b) 0.118 M C2H3O21-

pH before mixing =
pH after mixing=
pH change =

c) 0.118 M HC2H3O2

pH before mixing =
pH after mixing=
pH change =

d) a buffer solution that is 0.118 M in each C2H3O21- and HC2H3O2

pH before mixing =
pH after mixing=
pH change =

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Hubert Koch
Hubert KochLv2
13 Dec 2019

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Related questions

For 530.0 mL of pure water, calculate the initial pH and the final pH after adding 0.010 mol of HCl.

For 530.0 mL of a buffer solution that is 0.120 M in HC2H3O2 and 0.110 M in NaC2H3O2, calculate the initial pH and the final pH after adding 0.010 mol of HCl.

For 530.0 mL of a buffer solution that is 0.160 M in CH3CH2NH2 and 0.145 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol of HCl.

Part A

For 500.0 mL of pure water, calculate the initial pH and the final pH after adding 0.010 mol of HCl.

Express your answers using two decimal places separated by a comma.

pH initial, pH final =

Part B

For 500.0 mL of a buffer solution that is 0.155 M in HC2H3O2 and 0.135 M in NaC2H3O2, calculate the initial pH and the final pH after adding 0.010 mol of HCl.

Express your answers using two decimal places separated by a comma.

pH initial, pH final=

Part C

For 500.0 mL of a buffer solution that is 0.180 M in CH3CH2NH2 and 0.165 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol ofHCl.

Express your answers using two decimal places separated by a comma.

pH initial, pH final=

IV. Comparing Buffering Capacity

A. pH of Pure Water

i. Measure out 30.0 mL DI H2O into a beaker.

1. Calculate the expected pH of pure water. pH ________

2. Measured pH of pure water. pH ___3.88______

3. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error __________

B. pH of Water and Strong Acid

i. Measure out 30.0 mL DI H2O and 2.0 mL of 1.0 M HCl into a beaker.

1. Calculate the expected pH of this solution. pH _________

2. Measured pH of this solution. pH ___1.64______

3. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error ____

C. pH of Water and Strong Base

i. Measure out 30.0 mL DI H2O and 2.0 mL of 1.0 M NaOH into a beaker.

1. Calculate the expected pH of this solution. pH _________

2. Measured pH of this solution. pH __12.03_______

3. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error ____

D. pH of Buffer solution

i. Measure out 50.0 mL 1.0 M CH3COOH and 50.0 mL of 1.0 M NaCH3COO into a beaker.

1. Calculate the total volume. (include units) Vol __________

2. What is the concentration of acetic acid in this solution after mixing. (include units)

[CH3COOH] _________

3. What is the concentration of acetate ion in this solution after mixing. (include units)

[CH3COO-] ___________

4. Calculate the expected pH of this buffer solution. pH __________

5. Measured pH of this buffer solution. pH __4.56________

6. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error __________

E. pH of Buffer after the addition of the Strong Acid

Measure out 50.0 mL the buffer in part D and add 2.0 mL of 1.0 M HCl into a clean beaker.

1. Calculate the expected pH of this solution. pH _________

2. Measured pH of this solution. pH ____5.30_____

3. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error ____

F. pH of Buffer after the addition of the Strong Base

Measure out 50.0 mL the buffer in part D and 2.0 mL of 1.0 M NaOH into a clean beaker.

1. Calculate the expected pH of this solution. pH _________

2. Measured pH of this solution. pH _4.57________

3. What is the percent error between the calculated and measured value? What are some of the possible sources of this error?

% error ____

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