The first and second dissociation constants of a diprotic acid are and , respectively. The overall d — Ionic Equilibrium Chemistry Question
Question
The first and second dissociation constants of a diprotic acid $H_2A$ are $1.0 \times 10^{-5}$ and $5.0 \times 10^{-10}$, respectively. The overall dissociation constant of the acid will be:
Answer: B
💡 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: $K_{eq} = K_{a1} \times K_{a2} = (1.0 \times 10^{-5}) \times (5.0 \times 10^{-10}) = 5.0 \times 10^{-15}$.
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