Sodium bromate

Last updated
Sodium bromate
Sodium bromate Bromicnan sodny.JPG
Sodium bromate
NaBrO3.svg
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 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 232-160-4
PubChem CID
RTECS number
  • EF8750000
UNII
UN number 1494
  • InChI=1S/BrHO3.Na/c2-1(3)4;/h(H,2,3,4);/q;+1/p-1 Yes check.svgY
    Key: XUXNAKZDHHEHPC-UHFFFAOYSA-M Yes check.svgY
  • 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
Appearancecolorless 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
Std molar
entropy (S⦵298)
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:
GHS-pictogram-rondflam.svg GHS-pictogram-exclam.svg GHS-pictogram-silhouette.svg
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)
NFPA 704.svgHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard OX: Oxidizer. E.g. potassium perchlorate
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).
X mark.svgN  verify  (what is  Yes check.svgYX mark.svgN ?)

Sodium bromate, the inorganic compound with the chemical formula of NaBrO3, is the sodium salt of bromic acid. It is a strong oxidant. [1]

Contents

Uses

Sodium bromate is mainly used in continuous or batch dyeing processes involving sulfur or vat dyes and as a hair-permagent. In gold mining, it is used in combination with sodium bromide to dissolve gold.

In organic chemistry, sodium bromate is used for a variety of oxidations such as the conversion of alcohols to ketones. [2] Some such oxidations proceed with scission of C-C bonds. [3]

Production

Sodium bromate can be produced from a solution of sodium carbonate and bromine using chlorine gas as the oxidising agent. [4]

6 Na2CO3 + Br2 + 5 Cl2 → 2 NaBrO3 + 10 NaCl + 6 CO2

It may also be produced by the electrolytic oxidation of aqueous sodium bromide. [5]

Human health issues

Bromate in drinking water is undesirable because it is a suspected human carcinogen. [6] [7] Its presence in Coca-Cola's Dasani bottled water forced a recall of that product in the UK. [8]


References

  1. ↑ Yoffe, David; Frim, Ron; Ukeles, Shmuel D.; Dagani, Michael J.; Barda, Henry J.; Benya, Theodore J.; Sanders, David C. (2013). "Bromine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. pp. 1–31. doi:10.1002/14356007.a04_405.pub2. ISBN   978-3-527-30385-4.
  2. ↑ Harrison, James J.; Kulkarni, Amol A. (2013). "Sodium Bromate". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rs053.pub2. ISBN   978-0-471-93623-7.
  3. ↑ Donald A. Ballard, William M. Dehn (1921). "Benzilic Acid". Organic Syntheses. 1: 29. doi:10.15227/orgsyn.001.0029.
  4. ↑ CNpatent 1034653C,Zhao Naizhi; Wu Zongsheng; Sun Guishi,published 1997-04-23, assigned to Daqinghe Saltern Changlu Hebei Prov.
  5. ↑ WOpatent 1996030562A1,David B. Blum; Rodney H. Sergent; Vadim Zolotarsky,"Process and apparatus for generating bromine",published 1996-10-03, assigned to Electrocatalytic Inc
  6. ↑ "Potassium Bromate (Group 2B)". International Agency for Research on Cancer: Summaries and Evaluations. Canadian Centre for Occupational Health and Safety . Retrieved 2008-03-09.
  7. ↑ 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.
  8. ↑ "Coke recalls controversial water". BBC News . 2004-03-19. Retrieved 2008-03-09.

Notes


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