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JAMB Chemistry 2014 Question 13

Question 13

Water

Water is said to be temporarily hard when it contains

  1. A.Ca(HCO3)2 and Mg(HCO3)2 salts.
  2. B.Ca(HCO3)2 and CaCO3 salts.
  3. C.Mg(HCO3)2 and CaSO4 salts.
  4. D.CaSO4 and Ca(HCO3)2 salts.
Show the answer and explanation

Answer: A (Ca(HCO3)2 and Mg(HCO3)2 salts.)

Explanation

Temporary hardness is caused by dissolved calcium and magnesium hydrogentrioxocarbonates(IV), which boiling removes.