Difference between revisions of "Barium bromate"
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| OtherAnions = [[Barium chlorate]]<br/>[[Barium iodate]] | | OtherAnions = [[Barium chlorate]]<br/>[[Barium iodate]] | ||
| − | | OtherCations = [[Calcium bromate]]<br/>[[Strontium bromate]] | + | | OtherCations = [[Magnesium bromate]]<br/>[[Calcium bromate]]<br/>[[Strontium bromate]] |
| OtherCpds = [[Barium bromide]]<br/>[[Barium hypobromite]]<br/>[[Barium bromite]] | | OtherCpds = [[Barium bromide]]<br/>[[Barium hypobromite]]<br/>[[Barium bromite]] | ||
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Revision as of 12:03, 4 January 2011
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Barium bromate, Ba(BrO3)2, is the barium salt of bromic acid. It is used as a corrosion inhibitor.[1]
Preparation
Barium bromate is usually prepared by the electrolysis of barium 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.[3] The barium bromate can be crystallized by cooling the electrolyte, and any unoxidized bromide recycled.[1]
Barium bromate can also be prepared by reacting bromine with barium hydroxide solution at 50–90 °C.[1][4]
- 3 Br2 + 3 OH− ⇌ BrO−3 + 5 Br− + 3 H+
Decomposition
Anhydrous barium bromate decomposes at about 270 °C to give barium bromide and oxygen:[1]
- Ba(BrO3)2 → BaBr2 + 3 O2
Controlled decomposition in vacuo at 250 °C gives barium bromite:[5]
- Ba(BrO3)2 → Ba(BrO2)2 + O2
Notes and references
Notes
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Ukeles, S. D.; Freiberg, M. Bromine, Inorganic Compounds. In Kirk-Othmer Encyclopedia of Chemical Technology; John Wiley: New York, 2002. DOI: 10.1002/0471238961.021815131001031.
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-80. ISBN 0-8493-0462-8.
- ↑ Osuga, Takasi; Sugino, Kiichiro Electrolytic Production of Bromates. J. Electrochem. Soc. 1957, 104 (7), 448–51. DOI: 10.1149/1.2428623.
- ↑ Prager, Aavi; Smilovitch, Shaul; Freiberg, Mira, et al. (Bromine Compounds Ltd.) Alkali and alkaline earth metal bromide and bromate solid mixtures and process for preparation thereof. IL Patent 84830, published 24 January 1995.
- ↑ Downs, A. J.; Adams, C. J. In Comprehensive Inorganic Chemistry; Bailar, J. C., Jr.; Emeleus, H. J.; Nyholm, R., et al., Eds.; Pergamon: Oxford, 1973; Vol. 2, pp 1419–20.
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