How can the hardness of water be removed by boiling?

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Solution

By boiling, carbon dioxide is driven off and the soluble hydrogen carbonates are converted into insoluble carbonates and could be removed by filtration or decantation. $Ca {({HCO}_{3})}_{2} \to {CaCO}_{3} + H_{2} O + {CO}_{2}$

Calcium carbonate and magnesium carbonate are precipitated leaving the water soft.

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