A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total…

Chemistry JAMB 1978

A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by

  • boiling the water
  • adding excess calcium hydroxide
  • adding a calculated amount of calcium hydroxide
  • adding sodium carbonate checkmark
  • adding magnesium hydroxide

The correct answer is: D

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