9.22. What causes the temporary and permanent hardness of water?
9.22. What causes the temporary and permanent hardness of water?
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1 Answer
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9.22. Temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium in water i.e., Ca (HCO3)2 and Mg (HCO3) in water. Permanent hardness of water is due to the presence of soluble chlorides and sulphates of calcium and magnesium i.e., CaCl2, CaSO4, MgCl2 and MgSO4.
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