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Explain the process of softening of temporary hardness by Clark’s method.

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Temporary hard water is converted into soft water by adding required amount of calcium hydroxide. In this method Mg2+ ions are precipitated as Mg(OH)2 and Ca2+ ions are precipitated as CaCO3.

Mg (HCO3)2 →Mg (OH)2 + 2CO2

Ca (HCO3)2→ 2CaCO→ 2H2O + 2CO2.

The insoluble precipitates can be removed by filtration.

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