Bromate
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The bromate anion, BrO3−, is a bromine-based oxoanion. A bromate is a chemical compound that contains this ion. Examples of bromates include sodium bromate, NaBrO3), and potassium bromate, (KBrO3).
Bromates are formed when ozone and bromide ion react according to the following reaction:
This reaction occurs in water systems where bromide is dissolved in water and ozone is used to disinfect the water, especially under high presssures. This reaction is undesirable because bromate is a carcinogen. The presence of it in Coca Cola's Dasani forced a recall of that product in the UK[1]. Proposals to reduce bromate formation include switching to atmospheric tank contact systems, lowering the water pH to between 5.9 - 6.3, and limiting the doses of ozone.
In laboratories Bromates can be synthesized by dissolving Br2 in in a concentrated solution of KOH, the following reactions will take place:
