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

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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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