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The method used to remove temporary hardness of water is :(1) Calgon's method(2) Clark's method(3) Ion-exchange method(4) Synthetic resins method |
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Answer» Correct option (2) Clark's method Explanation: Clark's method is used to remove temporary hardness of water, in which bicarbonates of calcium and magnesium are reacted with slaked lime Ca(OH)2 Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 ↓+ 2H2O Mg(HCO3)2 + 2Ca(OH)2 → 2CaCO3 ↓ + Mg(OH)2 ↓ + 2H2O |
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