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Removal of temporary hardness by boiling

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Boiling precipitates out the calcium and magnesium ions as calcium or magnesium carbonate.

Ca(HCO₃)₂(aq)CaCO₃(s) + H₂O(l) + CO₂(g)

Mg(HCO₃)₂(aq)MgCO₃(s) + H₂O(l) + CO₂(g)