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Equivalent weight of Oxidising and Reducing Agents

Equivalent weight of Oxidising and Reducing Agents

Equivalent weight of a substance (oxidant or reductant) is equal to molecular weight divided by number of electrons lost or gained by one molecule of the substance in a redox reaction.

Eq. wt. of O. A. =

=

Eq. wt. of R. A. =

=

Table : Equivalent weight of few oxidising/reducing agents

Agents O. N. Product O. N. Change in
O. N. per
atom
Total
Change in
O. N. per mole
Eq. wt.
+ 6 + 3 3 3 × 2 = 6 Mol. wt./6
+ 3 + 4 1 1 × 2 = 2 Mol. wt./2
+ 2 + 2.5 0.5 0.5 × 2 = 1 Mol. wt./1
– 1 – 2 1 1 × 2 = 2 Mol. wt./2
– 1 0 1 1 × 2 = 2 Mol. wt./2

(Acidic medium)
+ 7 + 2 5 5 × 1 = 5 Mol. wt./5

(Neutral medium)
+ 7 + 4 3 3 × 1 = 3 Mol. wt./3

(Alkaline medium)
+ 7 + 6 1 1 × 1 = 1 Mol. wt./1

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