9.54. What is meant by hard water? How come boiling remove the temporary hardness of water?
9.54. What is meant by hard water? How come boiling remove the temporary hardness of water?
9.54. Water which does not produce lathers with soap is known as hard water. Hardness is due to the presence of bicarbonates, sulphates and chlorides of Ca2+ and Mg2+.
On boiling, the bicarbonates of calcium and magnesium decompose to insoluble carbonate which can be removed by filtration.
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