Which salt forms a solution with a pH

Question

Which salt forms a solution with a pH < 7 when dissolved in water?

Quizplus · Accepted Answer

The correct choice is D, which represents ammonium sulfate $(NH_4)_2SO_4$. When dissolved in water, ammonium sulfate dissociates into ammonium ions $(NH_4^+)$ and sulfate ions $(SO_4^{2-})$. The ammonium ion is a weak acid because it can donate a proton (H+) to water, forming hydronium ions $(H_3O^+)$ and thereby lowering the pH of the solution. The other salts listed are either neutral or form basic solutions when dissolved in water.

Which Salt Forms a Solution with a PH < 7