Question

When ferrous sulphate acts as reductant its Equivalent weight is
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Answer 1

Consider,

FeS2 -----> Fe2O3 +SO2

Where oxidation number of Fe on reactant side is +2 and on product side is +3 , oxidation number of S on reactant side is -1 and on product side is +4 .

If only one molecule undergoes both oxidation (Fe) and reduction (S) . Then equivalent weight of the molecule is the sum of equivalent weights of both oxidant and reductant . But given that the molecule undergoes reductant . Therefore the equivalent weight of reducing agent = molecular weight/number of electrons involved . Here Fe is reducing agent , which loses l electron , 1 electron is involved . Therefore the equivalent weight of the molecule is M÷1=M

Equivalent weight = it's molecular weight