The ${\mathrm{P}}^{\mathrm{H}}$ of an aqueous solution of ${\mathrm{NH}}_4\mathrm{CN}$

$\left({\mathrm{K}}_{\mathrm{a}} \mathrm{of} \mathrm{HCN} \mathrm{is} 9.2\times {10}^{-10}\& {\mathrm{K}}_{\mathrm{b}} \mathrm{of} {\mathrm{NH}}_4\mathrm{OH} \mathrm{is} 1.8\times {10}^{-5}\right)$

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