First slide

Acidic buffer

Question

50 ml of 0.1 M solution of sodium acetate and 50 ml of 0.01 M acetic acid are mixed. The pKa of acetic acid is 4.76. The pH of the buffer solution is

Moderate

A

3.76
B

4.76
C

5.76
D

9.24

Solution

P^H of an acidic buffer is given as, $P^{H} = P^{K_{a}} + \log \frac{[salt]}{[acid]}$
$= 4.76 + \log \frac{\frac{50 \times 0.1}{100}}{\frac{50 \times 0.01}{100}}$
= 4.76 +1
= 5.76

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