Uploaded September 2016 | Updated September 2026, 1 week ago

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Halogenides and Halogenates form under acid catalysis the elemental halogens.
This is called synproportionation, where the product is an oxidation state between the
two former ones. Here it is 0 from -1 and +5.

Reduction:
2 BrO3(-) + 12 H3O(+) + 10e(-) to Br2 + 18 H2O

Oxidation:
2 Br(-) to Br2 + 2e(-)

In this experiment an aqueous solution of Potassium Bromide and Potassium Bromate is prepared (before the video). Then a few milliliters of Sulphuric Acid (38%) are added.
The color rapidly changes to a yellow (diluted bromine-water).