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  4. The hardness of water is estimated by

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Q. The hardness of water is estimated by

AMUAMU 2005

Solution:

The hard water contains soluble salts of calcium or magnesium. Therefore, the hardness of water is estimated by EDTA method.
EDTA (ethylene diamine tetracetic acid) is a white crystalline powder. It is used as a titrant for the volumetric estimation of calcium, magnesium and other metals. EDTA when treated with water forms stable complex with metal ions. Note

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