Calcium bromate

Calcium bromate IUPAC name Calcium bromate Other names Calcium bromate(V) Identifiers InChI InChI=1/2BrHO3.Ca/c2*2-1(3)4;/h2*(H,2,3,4);/q;;+2/p-2 InChIKey GROPHIUSZODNGU-NUQVWONBAH Standard InChI InChI=1S/2BrHO3.Ca/c2*2-1(3)4;/h2*(H,2,3,4);/q;;+2/p-2 Standard InChIKey GROPHIUSZODNGU-UHFFFAOYSA-L CAS number [10102-75-7] EC number 233-278-9 ChemSpider 55398 Properties Chemical formula Ca(BrO3)2 Molar mass 295.88 g mol−1 Appearance white solid Related compounds Other anions Calcium chlorate Calcium iodate Other cations Magnesium bromate Strontium bromate Barium bromate Other compounds Calcium bromide Calcium hypobromite Calcium bromite Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Calcium bromate monohydrate IUPAC name Calcium bromate — water (1/1) Identifiers Standard InChI InChI=1S/2BrHO3.Ca.H2O/c2*2-1(3)4;;/h2*(H,2,3,4);;1H2/q;;+2;/p-2 Standard InChIKey XRFGTGUVIPWOAG-UHFFFAOYSA-L EC number 233-278-9 Properties Chemical formula Ca(BrO3)2·H2O Molar mass 313.90 g mol−1 Appearance white crystalline solid Density 3.329 g cm−3 Melting point 180 °C dehydr. Solubility in water very soluble Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Calcium bromate, Ca(BrO₃)₂, is the calcium salt of bromic acid. It has been used as a flour treatment agent (INS 924b).

Preparation

Calcium bromate is usually prepared by the electrolysis of calcium bromide solution at 65–70 °C, in the presence of dichromate and using anodes of lead dioxide or iron and cathodes of stainless steel or copper. The calcium bromate can be crystallized by cooling the electrolyte, and any unoxidized bromide recycled.

Calcium bromate can also be prepared by reacting bromine with calcium hydroxide solution at 50–90 °C.

3 Br₂ + 3 OH⁻ ⇌ BrO−3 + 5 Br⁻ + 3 H⁺