Which among the following salt solutions will undergo the maximum degree of hydrolysis in water? — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

$NH_4CN$ is a salt derived from a weak acid ($HCN$) and a weak base ($NH_4OH$). For such salts, the degree of hydrolysis $h$ is approximated by $h = \sqrt{K_h}$ or more precisely $h/(1-h) = \sqrt{K_h}$. Since $K_h = K_w / (K_a \times K_b)$, the degree of hydrolysis is entirely independent of the initial concentration of the salt.