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JAMB Chemistry 1987 Question 18

Question 18

Acids, Bases and Salts

In which of the following are the aqueous solutions of each of the substances correctly arranged in order of decreasing acidity?

  1. A.Ethanoic acid, milk of magnesia, sodium chloride, hydrochloric acid and sodium hydroxide
  2. B.Ethanoic acid, hydrochloric acid, milk of magnesia, sodium chloride and sodium hydroxide
  3. C.Hydrochloric acid, ethanoic acid, sodium chloride, milk of magnesia and sodium hydroxide
  4. D.Hydrochloric acid, sodium hydroxide, sodium chloride, ethanoic acid and milk of magnesia.
Show the answer and explanation

Answer: C (Hydrochloric acid, ethanoic acid, sodium chloride, milk of magnesia and sodium hydroxide)

Explanation

Strong acid HCl is most acidic, then weak ethanoic acid, then neutral NaCl, then weakly alkaline milk of magnesia, and strongly alkaline NaOH last.