AIIMS 2003 Chemistry Water Hardness MCQ Question
The reagent commonly used to determine hardness of water titrimetrically is
oxalic acid
disodium salt of EDTA
sodium citrate
sodium thiosulphate
Correct Answer
Detailed Explanation
Disodium salt of ethylene diamine tetraacetic acid has been used for the estimation of M2+ metal ions like Mg2+, Ca2+ etc. by complexometric titrations. In this titration, indicator ions (D2- ions) form red-metal indicator complex, [MD-] with M2+ ions.
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