Equimolar aqueous solutions of , , , and are prepared. Which one will record the highest pH value? — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Acidic strength increases down the group: $H_2O < H_2S < H_2Se < H_2Te$. The conjugate base of the weakest acid is the strongest base. Therefore, $O^{2-}$ is the strongest base, making $Na_2O$ highly basic with the highest pH.