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JAMB Chemistry 2005 Question 8

Question 8

Sulphur and its Compounds

When sulphur (IV) oxide is passed into a solution of sodium hydroxide for a long time, it eventually produces a solution of

  1. A.NaHSO4
  2. B.Na2SO3
  3. C.NaHSO3
  4. D.Na2SO4
Show the answer and explanation

Answer: C (NaHSO3)

Explanation

SO2 first forms Na2SO3; with excess SO2 this reacts further (Na2SO3 + SO2 + H2O → 2NaHSO3) to give sodium hydrogensulphite.