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

Question

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 $82 \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$.\ Limiting molar conductance of HCN is\

Professor PC Thomas Classes · Answer

$\lambda_{\mathrm{HCN}}^{0}=\lambda_{\mathrm{H}^{+}}^{0}+\lambda_{\mathrm{CN}}^{0}$\ $=350+82=432$.\