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JAMB Chemistry 1988 Question 18

Question 18

Acids, Bases and Salts

Which of the following dilute solutions has the lowest pH value?

  1. A.Calcium trioxocarbonate (IV)
  2. B.Sodium trioxocarbonate (IV)
  3. C.Hydrochloric acid
  4. D.Ethanoic acid.
Show the answer and explanation

Answer: C (Hydrochloric acid)

Explanation

Hydrochloric acid is a strong acid, fully ionised, so it has the most H+ ions and the lowest pH. The carbonates are alkaline.