Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits…

Chemistry JAMB 2017

Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of

  • CaCO3 checkmark
  • Na2CO3
  • Na2SO4
  • CaSO4

The correct answer is: A

Explanation

Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.

Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over deposit of CaCO3

i.e CaCO3 + CO2 + H2O → Ca(HCO3)2

There is an explanation video available .

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