First slide

Acidic buffer

Question

$p^{H}$ of a mixture containing 100 ml of 0.1M acetic acid and 100 ml of 0.2M sodium acetate is 5.1. $p^{K_{a}}$ of acetic acid is

Easy

A

5.1
B

5.4
C

4.5
D

4.8

Solution

$p^{H} = p^{K_{a}} + \log \frac{[V_{s} N_{s}]}{[V_{a} N_{a}]}; 5.1 = p^{K_{a}} + \log \frac{[100 (0.2)]}{[100 (0.1)]}; 5.1 = p^{K_{a}} + \log 2; p^{K_{a}} = 5.1 - 0.301; p^{K_{a}} = 4.8;$

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