A) EDTA method
B) titrimetric method
C) conductivity method
D) distillation method
Correct Answer: A
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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