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JAMB Chemistry 1988 Question 16

Question 16

Water

The ion that may be assumed to have negligible concentration in a sample of water that lathers readily with soap is

  1. A.Mg2+
  2. B.K+
  3. C.CO32−
  4. D.HCO3−
Show the answer and explanation

Answer: A (Mg2+)

Explanation

Water that lathers readily is soft, so it contains almost no Ca2+ or Mg2+, the ions that cause hardness. K+ does not affect lathering.