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Question

Temporary hardness maybe be removed from water by adding?

A
Ca(OH)2
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B
CaCO3
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C
CaSO4
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D
HCl
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Solution

The correct option is B Ca(OH)2
  • Temporary hardness is caused by dissolved calcium or magnesium hydrogencarbonate.

Some of the methods to remove hardness from water are:

  • Chemical Process of Boiling Hard Water
  • Adding Slaked Lime (Clark's Process)
  • Adding Washing Soda
  • Calgon Process
  • Ion Exchange Process
  • Using Ion Exchange Resins

Clark’s method: In this method calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off.
Ca(HCO3)2+Ca(OH)22CaCO3()+2H2O
Mg(HCO3)2+Ca(OH)22CaCO3()+Mg(OH)2()+2H2O

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