In a comproportionation reaction involving bromine, what is the equivalent weight of Br2? (Atomic weight of Br = 80)

Correct answer: 80

Solution

In the standard comproportionation of Br2 with BrO3⁻ to give Br⁻, elemental bromine (0 oxidation state) is reduced to -1. Each Br atom in Br2 gains 1 electron, so 2 electrons per Br2, giving n-factor = 2. Equivalent weight = 160/2 = 80.

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