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Components of buffer solution are 0.1 M $H C N$ and 0.2 M $N a C N .$ What is the $p H$ of the solution $[p K_{a} = 9.3]$ $(\log 2 = 0.3)$

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$9.6$

$2.0$

$4.2$

$6.15$

answer is A.

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Detailed Solution

$p^{H} = p^{k a} + \log \frac{S}{A} = 9.3 + \log \frac{0.2}{0.1} = 9.3 + \log 2 = 9.3 + 0.3 = 9.6$

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