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Hardness of water is estimated by simple titration with which compound?(a) Na2(EDTA)(b) Fe(EDTA)(c) Mg(EDTA)(d) Co(EDTA)The question was posed to me by my college director while I was bunking the class.This interesting question is from Coordination Compounds Importance and Applications topic in section Coordination Compounds of Chemistry – Class 12

Answer»

The correct answer is (a) Na2(EDTA)

The best explanation: The Ca^2+ and MG^2+ ions form stable complexes with EDTA, and the difference in the stability CONSTANTS of Ca and Mg complexes helps in the estimation of HARDNESS of WATER.



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