Calcium bromate

Calcium bromate, Ca(BrO3)2, is a calcium salt of bromic acid. It is most commonly encountered as the monohydrate, Ca(BrO3)2•H2O.[3]

Calcium bromate
IUPAC name
Calcium bromate
Other names
bromic acid, calcium salt
3D model (JSmol)
ECHA InfoCard 100.030.240
EC Number
  • 233-278-9
E number E924b (glazing agents, ...)
Molar mass 295.8824 g/mol
Appearance White monoclinic crystals
Density 3.33 g/cm3[1]
Melting point 180 °C[2]
230 g/100 mL (20 °C)
-84.0·10−6 cm3/mol
Related compounds
Other anions
calcium bromide
calcium chloride
calcium sulfide
Other cations
potassium bromate
sodium bromate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

It can be prepared by reacting calcium hydroxide with sodium bromate or calcium sulfate with barium bromate. Above 180 °C, calcium bromate decomposes to form calcium bromide and oxygen.[3] In theory, electrolysis of calcium bromide solution will also yield calcium bromate.

It is used as a bread dough and flour "improver" or conditioner (E number E924b) in some countries.[4]


  1. "Public Health Goal for Bromate in Drinking Water" (PDF). Office of Environmental Health Hazard Assessment, California Environmental Protection Agency. December 2009. Retrieved August 21, 2018.
  2. Perry, Dale L (2016-04-19). Handbook of Inorganic Compounds, Second Edition. ISBN 9781439814628.
  3. Ropp, Richard C (2012-12-31). Encyclopedia of the Alkaline Earth Compounds. ISBN 9780444595539.
  4. Lewis, Richard J (1989). Food Additives Handbook. ISBN 9780442205089.

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