The reagent commonly used to determine hardness of water titrimetrically is
(a) oxalic acid
(b) sodium thiosulphate
(c) sodium citrate
(d) disodium salt of EDTA
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Disodium salt of ethylenediaminetetraacetic acid has been used for the estimation of M2+ metal ions like Mg2+ Ca2+ etc. by complexometric titrations. In this titration, indicator ions (D3- ions) form red- metal indicator complex, [MD-] with [M2+] ions. The release of the free indicator ion is marked by a change from red (colour of M2+ D]- complex) to blue (colour of D3- ion) colour.Read more on Sarthaks.com - https://www.sarthaks.com/238795/the-reagent-commonly-used-to-determine-hardness-of-water-titrimetrically-is
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