Can any other salts of magnesium andcalcium except their carbonates used for making water hard
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Solution
1. The bicarbonates, sulphates and chlorides of magnesium and calcium also make water hard.
The salts are CaHCO3 and MgHCO3 (bicarbonates), CaCl2 and MgCl2 (chlorides) and CaSO4 and MgSO4 (sulphates).