As said earlier, 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:
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| Fig: 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.
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| fig: Clark's method of removing hardness of water |
Carbonate + lime water = calcium carbonate + water
Ca (HCO3)2 + (Ca(OH)2 = CaCO3 + 2H2O
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