hardness of water is due to the presence of
assthha161:
calcium and magnesium salts
ok
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Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling. The lime scale can build up on the inside of the pipe restricting the flow of water or causing a blockage.
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CaSO4
MgSO4
these are the compound which causes permanent hardness in water
Presence of chlorides nitrates and sulphates of Ca and Mg mokes the water hard...
sorry this chloride is diffrent from nitrates .I had forget to put comma
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