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pH of a Solution

The pKa of ...

Question

The $p K_{a}$ of acetic acid and $p K_{b}$ of $N H_{4} O H$ are $4.76$ and $4.75$ . Calculate the $p H$ of ammonium acetate ions.

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Solution

$p H = 7 + \frac{1}{2} [p K_{a} - p K_{b}]$
$= 7 + \frac{1}{2} [4.76 - 4.75]$
$= 7 + \frac{1}{2} [0.01]$
$= 7 + 0.005$
$= 7.005$

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