What does bromate mean?
A bromate is a chemical compound that can be regarded as a salt or ester of bromic acid, characterised by the presence of the polyatomic anion BrO₃⁻. Common examples include potassium bromate and sodium bromate, both white crystalline solids with oxidising properties. The word belongs almost exclusively to the vocabulary of chemistry, water treatment, and food regulation rather than everyday conversation. It draws particular attention in public-health discussions: bromate can form in drinking water when ozone disinfection reacts with naturally occurring bromide ions, and potassium bromate, historically used as a dough conditioner in commercial baking, has been restricted or banned in numerous countries because animal studies linked it to cancer. Consequently, the word often carries an undertone of regulatory caution or concern. Related terms include bromine, the element from which the name derives, and bromide, a chemically distinct ion with which bromate is sometimes confused. For readers encountering it outside the laboratory, bromate usually signals a question of safety limits rather than pure science.
A salt or ester of bromic acid, containing the anion BrO₃⁻.
"Sodium bromate is used industrially as an oxidising agent in textile dyeing."
In technical writing the specific compound is nearly always named (e.g. potassium bromate); bare 'bromate' tends to appear when discussing the ion or the class of compounds generally, especially in water-quality regulation.
(Chemistry) To treat or react a substance with bromine or bromic acid; to introduce bromine into a compound.
"The aromatic ring was bromated under controlled laboratory conditions."
Chiefly used in organic chemistry contexts; the more common related verb is 'brominate'.
Used when referring to different salts or esters of bromic acid collectively, e.g. 'soluble bromates'.
"Laboratory safety guidelines cover the handling of soluble bromates."
The very compound once used to give bread a better rise—potassium bromate—is now banned as a flour additive in many countries over cancer concerns.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bromate
The word bromate derives from bromine, the element named in the early nineteenth century from Greek brōmos, meaning 'stench' or 'bad odour', a reference to the element's sharp smell. The suffix '-ate' follows standard chemical nomenclature for salts of acids whose names end in '-ic', so bromate denotes a salt of bromic acid. Its siblings in this naming family include bromide, the salt of hydrobromic acid, and the adjective bromic.
Related word forms
How bromate is actually used
Almost entirely confined to scientific, industrial, and regulatory writing. In everyday contexts the word typically appears in discussions of drinking-water quality or food additives, where it carries negative connotations because some bromates are considered potential carcinogens. The plural 'bromates' refers to different salts or esters of bromic acid rather than multiple instances of one substance.
Easily confused with bromate
A bromide contains the ion Br⁻ (from hydrobromic acid), whereas a bromate contains the oxyanion BrO₃⁻ (from bromic acid).
A chromate is a salt containing the CrO₄²⁻ anion from chromic acid, chemically unrelated to a bromate despite the similar -ate ending.