What causes the hardness of impure water?
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The water which does not produce lather with soap is called hard water. ... The hardness of water is caused by the presence of dissolved salts such as bicarbonates, sulphates, chlorides and nitrates of divalent metal ions like calcium and magnesium.
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The presence of calcium and magnesium salt causes hardness of water.
permanent hardening is cause due to dissolve calcium and magnesium sulphate which can not be separated by boiling.
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