CH3COOH <-------> CH3COO- + H+
Prepared 200 ml of 0.1 M sodium acetate solution using acetic acid (1.74M, 11.493 mL) and sodium acetate (1.641g).
Prepated 200 mL of 0.1 M acetic acid solution using the stock 1.74M acetic acid solution (11.494 mL).
testing buffer capacity of solutions
Used teh acetic acid and sodium acetate soltuions containing the volumes below:
1 2 3 4 5 6 7 Acetic Acid 18 mL 15 mL 12 mL 9 mL 6 mL 3 mL 0 mL Acetate 0 mL 3 mL 6 mL 9 ml 12 mL 15 mL 18 mL Buffer pH 3.27 4.14 4.45 4.73 5.01 5.39 7.41 pH with HCl 2.65 3.63 4.22 4.51 4.79 5.13 5.69 pH with NaOH 4.04 4.43 4.74 4.96 5.35 6.09 11.54
From the inital pH and ratio of weak acid to base, calculate the pKa of acetic acid using teh Henderson-Hasselbalch equation for all the effective buffering solutions and average th?e values. How does this compare to the actual pKa of acetic acid of 4.76? (Please show step-by-step process)
What is the observed effective pH buffering range for inital acetate buffers?
Which mixtures of acetate buffer resist pH changes to BOTH HCl and NaOH? How did you decide? Which would be the best buffer solution against added acid and base? Why?
CH3COOH <-------> CH3COO- + H+
Prepared 200 ml of 0.1 M sodium acetate solution using acetic acid (1.74M, 11.493 mL) and sodium acetate (1.641g).
Prepated 200 mL of 0.1 M acetic acid solution using the stock 1.74M acetic acid solution (11.494 mL).
testing buffer capacity of solutions
Used teh acetic acid and sodium acetate soltuions containing the volumes below:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | |
| Acetic Acid | 18 mL | 15 mL | 12 mL | 9 mL | 6 mL | 3 mL | 0 mL |
| Acetate | 0 mL | 3 mL | 6 mL | 9 ml | 12 mL | 15 mL | 18 mL |
| Buffer pH | 3.27 | 4.14 | 4.45 | 4.73 | 5.01 | 5.39 | 7.41 |
| pH with HCl | 2.65 | 3.63 | 4.22 | 4.51 | 4.79 | 5.13 | 5.69 |
| pH with NaOH | 4.04 | 4.43 | 4.74 | 4.96 | 5.35 | 6.09 | 11.54 |
From the inital pH and ratio of weak acid to base, calculate the pKa of acetic acid using teh Henderson-Hasselbalch equation for all the effective buffering solutions and average th?e values. How does this compare to the actual pKa of acetic acid of 4.76? (Please show step-by-step process)
What is the observed effective pH buffering range for inital acetate buffers?
Which mixtures of acetate buffer resist pH changes to BOTH HCl and NaOH? How did you decide? Which would be the best buffer solution against added acid and base? Why?
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