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JAMB Chemistry 2011 Question 14

Question 14

Water

Hardness of water is mainly due to the presence of

  1. A.calcium hydroxide or magnesium hydroxide
  2. B.calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
  3. C.sodium hydroxide or magnesium hydroxide
  4. D.calcium chloride or sodium chloride salts
Show the answer and explanation

Answer: B (calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI))

Explanation

Hard water contains dissolved calcium (and magnesium) salts, chiefly the hydrogen trioxocarbonate(IV) and the tetraoxosulphate(VI).