Ka of acetic acid is 2 x 10-5 . Buffer capacity of CH3COOH + CH3COONa buffer is maximum at a pH of

K_a of acetic acid is 2 x 10^-5. Buffer capacity of CH₃COOH + CH₃COONa buffer is maximum at a p^H of

A
3.7
B
4.7
C
5.7
D
7

Solution:

$\begin{array}{l} p^{K_{a}} ({CH}_{3} COOH) = - \log (2 \times 10^{- 5}) \\ = 5 - \log 2 \\ = 4 .7 Buffer capacity is maximum when p^{H} = p^{K_{a}} \end{array}$

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