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
CAS Number	7789-38-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:75229 ;
ChemSpider	23009 ;
ECHA InfoCard	100.029.237
EC Number	232-160-4;
PubChem CID	23668195;
RTECS number	EF8750000;
UNII	U54JK6453O ;
UN number	1494
CompTox Dashboard (EPA)	DTXSID9023837 ;
	InChI InChI=1S/BrHO3.Na/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1 Key: XUXNAKZDHHEHPC-UHFFFAOYSA-M ; InChI=1/BrHO3.Na/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1 Key: XUXNAKZDHHEHPC-REWHXWOFAY;
	SMILES [Na+].[O-]Br(=O)=O;
Properties
Chemical formula	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)
Solubility in water	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
Magnetic susceptibility (χ)	−44.2·10−6 cm3/mol
Refractive index (nD)	1.594
Structure
Crystal structure	cubic
Thermochemistry
Std molar; entropy (S⦵298)	130.5 J/mol K
Std enthalpy of; formation (ΔfH⦵298)	-342.5 kJ/mol
Gibbs free energy (ΔfG⦵)	-252.6 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Oxidizing agent
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H271, H272, H302, H315, H319, H335, H341, H350
Precautionary statements	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)	1 0 0 OX
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). verify (what is ?) Infobox references

Sodium bromate, the inorganic compound with the chemical formula of NaBrO₃, is the sodium salt of bromic acid. It is a strong oxidant.

Uses[edit]

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[edit]

Sodium bromate can be produced from a solution of sodium carbonate and bromine using chlorine gas as the oxidising agent.^[1] This reaction proceeds roughly^[a] according to the equation 3 Na₂CO₃ + Br₂ + 2 Cl₂ → 2 NaBrO₃ + 4 NaCl + 6 CO₂

It may also be produced by the electrolytic oxidation of aqueous sodium bromide.^[2]

Human health issues[edit]

Bromate in drinking water is undesirable because it is a suspected human carcinogen.^[3]^[4] Its presence in Coca-Cola's Dasani bottled water forced a recall of that product in the UK.^[5]

References[edit]

^ CN patent 1034653C, Zhao Naizhi; Wu Zongsheng; Sun Guishi, published 1997-04-23, assigned to Daqinghe Saltern Changlu Hebei Prov.
^ WO patent 1996030562A1, David B. Blum; Rodney H. Sergent; Vadim Zolotarsky, "Process and apparatus for generating bromine", published 1996-10-03, assigned to Electrocatalytic Inc
^ "Potassium Bromate (Group 2B)". International Agency for Research on Cancer: Summaries and Evaluations. Canadian Centre for Occupational Health and Safety. Retrieved 2008-03-09.
^ 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.
^ "Coke recalls controversial water". BBC News. 2004-03-19. Retrieved 2008-03-09.

Notes[edit]

^ The cited patent gives a real molar ratio of 2.83:1:2.40 for Na₂CO₃:Br₂:Cl₂, and approximately a 1:5 NaBrO₃:NaCl molar yield, as some of the bromine is not fully oxidised to bromate, remaining in the mother liquor as sodium bromide.

External links[edit]

Sodium Bromate MSDS On The Wayback Machine: December 6 2018

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[1] CN patent 1034653C, Zhao Naizhi; Wu Zongsheng; Sun Guishi, published 1997-04-23, assigned to Daqinghe Saltern Changlu Hebei Prov.

[3] WO patent 1996030562A1, David B. Blum; Rodney H. Sergent; Vadim Zolotarsky, "Process and apparatus for generating bromine", published 1996-10-03, assigned to Electrocatalytic Inc

[4] "Potassium Bromate (Group 2B)". International Agency for Research on Cancer: Summaries and Evaluations. Canadian Centre for Occupational Health and Safety. Retrieved 2008-03-09.

[5] 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.

[6] "Coke recalls controversial water". BBC News. 2004-03-19. Retrieved 2008-03-09.

[2] The cited patent gives a real molar ratio of 2.83:1:2.40 for Na₂CO₃:Br₂:Cl₂, and approximately a 1:5 NaBrO₃:NaCl molar yield, as some of the bromine is not fully oxidised to bromate, remaining in the mother liquor as sodium bromide.

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