$p K_{a}$ of a weak acid (HA) and $p K_{b}$ of a weak base (BOH) are 3.2 and 3.4. respectively. The pH of their salt (AB) solution is

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7.2

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6.9

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Solution

The correct option is C 6.9
Ans: B

Given
$p K_{a} (H A) = 3.2$
$p K_{b} (B O H) = 3.4$

As given salt is of weak acid and weak base
$∴ p H = 7 + \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b}$
$= 7 + \frac{1}{2} (3.2) - \frac{1}{2} (3.4)$
= 6.9

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