Why EDTA use to check hardness of water?
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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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