Sodium bromate
Sodium bromate
The sodium cation
The bromate anion (space-filling model)
Names
IUPAC name
Sodium bromate
Other names
Sodium bromate(V)
Bromic acid, sodium salt
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.029.237 Edit this at Wikidata
EC Number
  • 232-160-4
RTECS number
  • EF8750000
UNII
UN number 1494
  • InChI=1S/BrHO3.Na/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1 checkY
    Key: XUXNAKZDHHEHPC-UHFFFAOYSA-M checkY
  • InChI=1/BrHO3.Na/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1
    Key: XUXNAKZDHHEHPC-REWHXWOFAY
  • [Na+].[O-]Br(=O)=O
Properties
NaBrO3
Molar mass 150.89g/mol
Appearance colorless or white solid
Odor odorless
Density 3.339 g/cm3
Melting point 381 °C (718 °F; 654 K)
Boiling point 1,390 °C (2,530 °F; 1,660 K)
27.5 g/100 mL (0 °C)
36.4 g/100 mL (20 °C)
48.8 g/100 mL (40 °C)
90.8 g/100 mL (100 °C)
Solubility soluble in ammonia
insoluble in ethanol
−44.2·10−6 cm3/mol
1.594
Structure
cubic
Thermochemistry
130.5 J/mol K
-342.5 kJ/mol
-252.6 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Oxidizing agent
GHS labelling:
GHS03: Oxidizing
GHS07: Exclamation mark
GHS08: Health hazard
Danger
H271, H272, H302, H315, H319, H335, H341, H350
P201, P202, P210, P220, P221, P261, P264, P270, P271, P280, P281, P283, P301+P312, P302+P352, P304+P340, P305+P351+P338, P306+P360, P308+P313, P312, P321, P330, P332+P313, P337+P313, P362, P370+P378, P371+P380+P375, P403+P233, P405, P501
NFPA 704 (fire diamond)
Flash point 381 °C (718 °F; 654 K)
Safety data sheet (SDS) ICSC 0196
Related compounds
Other anions
Sodium chlorate
Sodium iodate
Other cations
Potassium bromate
Calcium bromate
Related compounds
Sodium bromide
Sodium hypobromite
Sodium bromite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium bromate, the inorganic compound with the chemical formula of NaBrO3, is the sodium salt of bromic acid. It is a strong oxidant.

Uses

Sodium bromate is mainly used in continuous or batch dyeing processes involving sulfur or vat dyes and as a hair-permagent, chemical agent, or gold solvent in gold mines when used with sodium bromide.

Production

Sodium bromate is produced by passing bromine into a solution of sodium carbonate.[1] It may also be produced by the electrolytic oxidation of sodium bromide. Alternatively, it can also be created by the oxidation of bromine with chlorine to sodium hydroxide at 80 °C.

3 Br2+3 Na2CO3 → 5 NaBr+NaBrO3+3 CO2

Human health issues

Bromate in drinking water is undesirable because it is a suspected human carcinogen.[2][3] Its presence in Coca-Cola's Dasani bottled water forced a recall of that product in the UK.[4]

References

  1. ^ "Br2 + Na2CO3 = NaBr + NaBrO3 + CO2 | Chemical reaction and equation".
  2. ^ "Potassium Bromate (Group 2B)". International Agency for Research on Cancer: Summaries and Evaluations. Canadian Centre for Occupational Health and Safety. Retrieved 2008-03-09.
  3. ^ Kurokawa, Yuji; Maekawa, A; Takahashi, M; Hayashi, Y (July 1990). "Toxicity and carcinogenicity of potassium bromate—a new renal carcinogen". Environmental Health Perspectives. 87: 309–35. doi:10.1289/EHP.9087309. JSTOR 3431039. PMC 1567851. PMID 2269236.
  4. ^ "Coke recalls controversial water". BBC News. 2004-03-19. Retrieved 2008-03-09.