JAMB Chemistry 1991 Question 24

Question 24

Acids, Bases and Salts

Which of the following equimolar solutions, Na₂CO₃, Na₂SO₄, FeCl₃, NH₄Cl and CH₃COONa, have pH greater than 7?

Show the answer and explanation

Answer: C (Na₂CO₃ and CH₃COONa)

Explanation

Salts of a strong base and a weak acid (Na₂CO₃, CH₃COONa) hydrolyse to give alkaline solutions. Na₂SO₄ is neutral; FeCl₃ and NH₄Cl are acidic.