passwella.
Menu

JAMB Chemistry 1987 Question 14

Question 14

Water

Which of the following water samples will have the highest titre value when titrated for the Ca2+ ions using soap solution?

  1. A.Permanently hard water after boiling
  2. B.Temporarily hard water after boiling
  3. C.Rain water stored in a glass jar for two years
  4. D.Permanently hard water passed through permutit.
Show the answer and explanation

Answer: A (Permanently hard water after boiling)

Explanation

Boiling does not remove permanent hardness, so that sample still has its Ca2+ ions and needs the most soap. Boiling removes temporary hardness, permutit removes permanent hardness and rain water is soft.