Chemistry, asked by rahulwk2393, 1 year ago

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

Answers

Answered by sashanksaimanikanta
1

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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