Question

Given 1 m solutions of acetic acid and sodium acetate, and distilled water, describe the preparation of 1 l of 0.1 m acetate buffer at ph = 5.4.

The relevant pKa is 4.76. 22

Answer 1

To prepare a 1 L, 0.1 M acetate buffer with a pH of 5.4, you need to calculate the required amounts of acetic acid and sodium acetate.

Step-by-step explanation:

To prepare a 1 L, 0.1 M acetate buffer with a pH of 5.4 using acetic acid and sodium acetate, you need to calculate the required amounts of each component. Here are the steps:

1. Calculate the ratio of acetic acid to sodium acetate using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). In this case, pKa is 4.76 and you want the pH to be 5.4. Plug these values into the equation to find the ratio.
2. Determine the total concentration of the buffer solution. Since you want a 0.1 M buffer, the sum of the concentrations of acetic acid and sodium acetate should be 0.1 M.
3. Use the ratio from step 1 to calculate the amounts of acetic acid and sodium acetate needed to achieve the desired buffer concentration.
4. Mix the calculated amounts of acetic acid, sodium acetate, and distilled water to prepare the 1 L, 0.1 M acetate buffer at pH 5.4.

Use the Henderson-Hasselbalch equation to find the ratio of acetic acid to sodium acetate, then determine the total concentration of the buffer solution. Finally, mix the calculated amounts of acetic acid, sodium acetate, and distilled water.