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JAMB Chemistry 2005 Question 1

Question 1

Acids, Bases and Salts

Which of the following equimolar solutions will have the highest pH?

  1. A.CH3COONa
  2. B.NaOH
  3. C.HCl
  4. D.NH4OH
Show the answer and explanation

Answer: B (NaOH)

Explanation

NaOH is a strong alkali and ionises completely, so it gives the most OH− ions and the highest pH. NH4OH is a weak base and CH3COONa only slightly alkaline by hydrolysis.