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What causes the temporary and permanent ...

What causes the temporary and permanent hardness of water ?

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Temporary hardness of water is due to the presence of soluble salts of magnesium and calcium in the form of hydrogen carbonates `(MHCO_(3), "where" M = Mg, Ca)` in water.
Permanent hardness of water is because of the presence of soluble salts of calcium and magnesium in the form of chlorides in water.
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