$p K_{a}$ 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:

6.9

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7.2

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Solution

The correct option is A 6.9
$p H = 7 + \frac{p K_{a}}{2} - \frac{p K_{b}}{2}$

$= 7 + \frac{3.2}{2} - \frac{3.4}{2}$

$= 6.9$

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