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Introduction and Degree of Hydrolysis

pH of a buffe...

Question

$p H$ of a buffer $0.1$ M $N a_{2} H P O_{4}$ and $0.2$ M $N a H_{2} P O_{4}$ is:
( $p K_{a}$ for $H_{2} P O_{4}$ are $2.2, 7.2$ and $12.0$ )

4.7

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9.6

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4.5

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6.91

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Solution

The correct option is C $9.6$
The buffer contains $0.1 M$ $N a_{2} H P O_{4}$ and $0.2 M$ $N a H_{2} P O_{4}$
$p H = \frac{p K_{a} (N a_{2} H P O_{4}) + p K_{a} (N a H_{2} P O_{4})}{2}$
$= \frac{7.2 + 12.0}{2} = 9.6$

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