A solution of has and . What is the exact concentration of the sulfide ion, , in the solution? — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

In a pure solution of a weak polyprotic acid, the concentration of the divalent anion is strictly equal to its second dissociation constant ($K_{a2}$). Thus, $[S^{2-}] = 10^{-14} \text{ M}$.