water

Removal of Temporary Hardness of Water

Temporary hardness of water can be removed easily. The following methods may be adopted for the removal of temporary hardness of water.

i ) By boiling:

 

boiling water

Boiling water

A soluble bicarbonate salt of calcium and magnesium becomes insoluble salt on heating. The insoluble salt settles at the bottom of boiler.
Calcium hydrogen   =  calcium    +     carbon    + water.
            carbonate            carbonate       dioxide
Ca(HCO3)2 = CaCO3 + CO2 + H2O

ii) Treatment with lime water :

Temporary hardness of water can be removed by treating with lime water. This is known as Clark’s method.
Carbonate + lime water = calcium carbonate + water
Ca (HCO3)2 + (Ca(OH)2  = CaCO3 + 2H2O
9 replies
  1. van cleef collier réplique
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