Equimolar aqueous solutions of , , , and are prepared. Which one will record the highest pH value? — Ionic Equilibrium Chemistry Question
Question
Equimolar aqueous solutions of $Na_2O$, $Na_2S$, $Na_2Se$, and $Na_2Te$ are prepared. Which one will record the highest pH value?
Answer: A
💡 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.
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