Aqueous solutions of various compounds of identical concentrations are provided. Which of the follow — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

A buffer requires a weak acid/base and its conjugate salt. (A) Strong acid is limiting; leaves excess $NH_4OH$ alongside formed $NH_4Cl$ (Basic Buffer). (B) Strong acid is limiting; reacts with $CH_3COONa$ to form $CH_3COOH$, leaving excess $CH_3COONa$ (Acidic Buffer). (C) Strong base is limiting; leaves excess $CH_3COOH$ alongside formed $CH_3COONa$ (Acidic Buffer). (D) Equimolar amounts completely neutralize to form only salt, which undergoes hydrolysis but is NOT a buffer.