What do you mean by permanent hardness of water.
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Permanent Hardness of Water:
When the soluble salts of magnesium and calcium are present in the form of chlorides and sulphides in water, we call it permanent hardness because this hardness cannot be removed by boiling.
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Temporary hardness is due to the soluble salts of magnesium and calcium in the form of hydrogen carbonates. and this hardness can be removed from water by boiling. Permanent hardness of water is due to the presence of soluble salts of calcium and magnesium in the form of chlorides in water.
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