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JAMB Chemistry 1985 Question 38

Question 38

Acids, Bases and Salts

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula

  1. A.NaOH.H2O
  2. B.NaOH.N2
  3. C.Na2CO3
  4. D.NaHCO3
  5. E.NaNO3
Show the answer and explanation

Answer: C (Na2CO3)

Explanation

NaOH absorbs carbon (IV) oxide from the air: 2NaOH + CO2 → Na2CO3 + H2O. Sodium carbonate is also alkaline.