Question

how temporary hardness is removed from water

Answer 1

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Temporary hard water contains slightly soluble calcium bicarbonate. Calcium carbonate is essentially insoluble, but water that contains CO2 can dissolve a little CaCO3 to give Ca(HCO3)2. This is “hard” on soap. Bicarbonate loses CO2 to air and the calcium carbonate precipitates again in caves giving stalactites and stalagmites. You can accelerate this process by heating the water; the CaCO3 formed will precipitate out and the water will be less hard, maybe soft enough.

Answer 2

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Temporary hard water contains slightly soluble calcium bicarbonate. Calcium carbonate is essentially insoluble, but water that contains CO2 can dissolve a little CaCO3 to give Ca(HCO3)2. This is “hard” on soap. Bicarbonate loses CO2 to air and the calcium carbonate precipitates again in caves giving stalactites and stalagmites. You can accelerate this process by heating the water; the CaCO3 formed will precipitate out and the water will be less hard, maybe soft enough.
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