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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

AgentsO. N.ProductO. N.Change in
O. N. per
atom
Total
Change in
O. N. per mole
Eq. wt.
+ 6+ 333 × 2 = 6Mol. wt./6
+ 3+ 411 × 2 = 2Mol. wt./2
+ 2+ 2.50.50.5 × 2 = 1Mol. wt./1
– 1– 211 × 2 = 2Mol. wt./2
– 1011 × 2 = 2Mol. wt./2

(Acidic medium)
+ 7+ 255 × 1 = 5Mol. wt./5

(Neutral medium)
+ 7+ 433 × 1 = 3Mol. wt./3

(Alkaline medium)
+ 7+ 611 × 1 = 1Mol. wt./1

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