Question

Why disodium salt of edta is chosen for determination of hardness?

Answer 1

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ȯ Hardness in water is due to the presence of dissolved salts of calcium and magnesium. ... Hardness of water is determined by titrating with a standard solution of ethylene diamine tetra acetic acid (EDTA) which is a complexing agent. Since EDTA is insoluble in water, the disodium salt of EDTA is taken for this experiment.

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Answer 2

Principle: Hardness in water is due to the presence of dissolved salts of calcium and magnesium. ... Since EDTA is insoluble in water, the disodium salt of EDTA is taken for this experiment. EDTA can form four or six coordination bonds with a metal ion.