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Hardness of Water:Causes, Types and Treatments

The reagent c...

Question

The reagent commonly used to determine hardness of water is:

A

oxalic acid

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B

disodium salt of EDTA

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C

sodium citrate

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D

sodium thiosulphate

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Solution

The correct option is B disodium salt of EDTA
Determination of hardness of water is done by titration method using the technique of complexometric titration.
Ethylenediamine tetra-acetic acid and its sodium salts (EDTA) form a chelated soluble complex when it is titrated against a solution containing certain metal cations that cause hardness to water.

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