The first and second dissociation constants of a diprotic acid are and , respectively. The overall d — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

The overall dissociation reaction is $H_2A \rightleftharpoons 2H^+ + A^{2-}$. The overall constant $K_{eq}$ is the product of the stepwise constants: $K_{eq} = K_{a1} \times K_{a2} = (1.0 \times 10^{-5}) \times (5.0 \times 10^{-10}) = 5.0 \times 10^{-15}$.