why is H2O2 added to the precipitate of Fe(OH)3 and Cr(OH)3?

Expert Solution

If is added in the mixture of precipitate of and then in the presence of hydrogen peroxide 3%, will be converted into chromate ion by an oxidation-reduction reaction and goes into solution, by leaving the .

The chemical reaction can be written as

The presence of can be confirmed by adding of to form which is yellow precipitate and can be confirmed by adding of HCl or potassium thiocyanate KSCN .

Hence it can be concluded that is added to and to separate the ions.

queen_honey_blossom answered 8 months ago

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