MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryHydrogenHardness of Water

The hardness of water is estimated by

A.EDTA method✓ Correct

B.titrimetric method

C.conductivity method

D.distillation method

Explanation

Hardness of water is due to the presence of salts of calcium and magnesium. The hardness of water is estimated by using EDTA method. In this method, salt of sodium ethylenediaminetetraacetate is used to react with the ions of calcium and magnesium and the hardness is estimated by qualitative methods 2 2 2 2 Mg aq Na EDTA aq Na Mg EDTA aq ->

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