An aqueous solution of which of the following salts will have a pH greater than 7 at 298 K ?

Step-by-step solution

A solution with pH > 7 is basic, which is formed by the hydrolysis of a salt derived from a weak acid and a strong base. NH₄Cl is a salt of a strong acid ( HCl ) and a weak base ( NH₄OH ). Its aqueous solution is acidic, so pH KNO₃ is a salt of a strong acid ( HNO₃ ) and a strong base ( KOH ). Its aqueous solution is neutral, so pH = 7 . CH₃COOK is a salt of a weak acid ( CH₃COOH ) and a strong base ( KOH ). The acetate ion undergoes anionic hydrolysis to produce OH^- ions, making the solution basic, so pH > 7 . Na