Paragraph - The $\mathrm{pK}_{\mathrm{a}}$ of hydrocyanic acid, HCN , is 10 at 293 K . Calculate the

Question

Paragraph - The $\mathrm{pK}_{\mathrm{a}}$ of hydrocyanic acid, HCN , is 10 at 293 K . Calculate the molar conductance of an aqueous solution of HCN , of concentration $0.01 \mathrm{~mol} \mathrm{dm}^{-3}$, given that the limiting ionic conductance of $\mathrm{H}^{+}$ions is $350 \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$ and of $\mathrm{CN}^{-}$ions is $82 \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$. Use the data and answer questions 68-70\ The degree of dissociation of 0.01 M HCN is\

Professor PC Thomas Classes · Answer

Hydrocyanic acid is a weak acid. so\ $\alpha=\sqrt{\frac{K a}{c}}=\sqrt{\frac{10^{-10}}{0.01}}=10^{-4}$\