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13 Dec 2019

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A buffer is made by mixing 50.0 mL of .10 M acetic acid and 50.0 mL of 0.25 M potassium acetate.

QUESTION: Calculate the pH of the buffer solution and Calculate the pH of the buffer solution after adding 1.0 mL of 3.0 M NaOH

CONSIDER: IF the NaOH were added to 100.0 mL of pure water what would the pH result be?

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Collen VonLv2

17 Dec 2019

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So, I had a previous question that asked "The K_a of acetic acid is 1.76x10^-5. Calculate the pH of a buffer prepared by combining 50.0 mL of 1.00 M potassium acetate and 50.0 mL of 1.00 M acetic acid." It was determined that the pH was about 4.75. Now, the next two questions are what I need help with:

1) Determine the change in pH when 5 mL of 1 M HCl is added to the buffer solution

2) Determine the change in pH when 5 mL of 1 M NaOH is added to the buffer solution

PLEASE show all work

a) How to do I calculate the pH of original buffer given mass ofNaC2H3O2*H2O (FW =136 g/mol) = 3.507 g
after measuring out 8.8 mL of 3.0 M acetic acid to add to thebeaker containing the sodium acetate. Then put in 55.6 mL ofdistilled water with the pH of original buffer solution =4.89

b) How then, how would I calculate the pH of a buffer + NCl aftertaking 32 mL of the solution noted above and pipet 1.0 mL of 6.0 MHCl with the pH of buffer + HCl = 4.41?

c) Finally, how to calculate the pH of buffer + NaOH with 32 mL ofthe first solution listed above and pipet 1.0 mL of 6.0 M NaOH withpH of buffer + NaOH = 5.28?

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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