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The K_a value of HCN is 10^-9. what is the pH of decimolar HCN solution.

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answer is B.

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Detailed Solution

$K_{a} = 10^{- 9}, c = 0.1 = 10^{- 1} M$
$[H^{+}] = \sqrt{K_{a} \cdot c} = \sqrt{10^{- 9} \cdot 10^{- 1}} = 10^{- 5} M$
$∴ P^{H} = - \log (10^{- 5}) = 5$

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