In the following reaction: 3Br2 + 6CO32- + 3H2O = 5Br - + BrO3- + 6HCO3-

In the oxidation process the oxidation number of bromine changes from 0 (in Br2) to +5 (in BrO3) and in reduction, oxidation number of bromine changes from 0 (in Br2) to -1 (in Br ).

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