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JAMB Chemistry 1985 Question 36

Question 36

Acids, Bases and Salts

Mixing of aqueous solutions of barium hydroxide and sodium tetraoxocarbonate (IV) yields a white precipitate of

  1. A.barium oxide
  2. B.sodium tetraoxocarbonate (IV)
  3. C.sodium oxide
  4. D.sodium hydroxide
  5. E.barium tetraoxocarbonate (IV).
Show the answer and explanation

Answer: E (barium tetraoxocarbonate (IV).)

Explanation

Ba(OH)2 + Na2CO3 → BaCO3 + 2NaOH. Barium carbonate is insoluble and comes out as a white precipitate; NaOH stays in solution.