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  4. The pKa of acetic acid and pKb of ammonium hydroxide are 4.76 and 4.75 respectively. The pH of ammonium acetate solution is

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Q. The $pK_a $ of acetic acid and $pK_b $ of ammonium hydroxide are $4.76$ and $4.75$ respectively. The $pH$ of ammonium acetate solution is

Equilibrium

Solution:

$pH = 7+\frac{1}{2} (pKa-p K b)$
$ = 7 + \frac{1}{2} (4.76 - 4.75) $
$= 7 + \frac{1}{2} (0.01) = 7 + 0.005 = 7.005 $