9.22  What causes the temporary and permanent hardness of water ? 

Answers (1)
R Rakesh

Answer- Temporary hardness of water is because of the presence of salts of magnesium and calcium hydrogen carbonates.(MHCO_{3}) [ M = Mg,Ca]. Permanent hardness is due to the presence of soluble salts of magnesium and calcium in the form of chlorids and sulphates in water. e.g, MCl_{2}/MSO_{4}

[M = Mg and Ca]

 

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