Difference between revisions of "Bromic acid"
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| − | | IUPACName = | + | | IUPACName = Bromic acid{{#tag:ref|Bromic acid is a [[retained name]] in IUPAC nomenclature.<ref>{{RedBook2005|page=287}}.</ref>|group=note}} |
| − | | OtherNames = Bromic( | + | | OtherNames = Bromic(V) acid<br/>Hydroxy-λ<sup>5</sup>-bromanedione<br/>Hydroxidodioxidobromine |
| Section1 = {{Chembox Identifiers | | Section1 = {{Chembox Identifiers | ||
| ChemSpiderID = 22853 | | ChemSpiderID = 22853 | ||
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| Section2 = {{Chembox Properties | | Section2 = {{Chembox Properties | ||
| − | | Reference = <ref>{{Greenwood&Earnshaw1st|pages=1009–13}}.</ref> | + | | Reference = <ref name="G&E">{{Greenwood&Earnshaw1st|pages=1009–13}}.</ref> |
| Formula = HBrO<sub>3</sub> | | Formula = HBrO<sub>3</sub> | ||
| MolarMass = 128.91 g mol<sup>−1</sup> | | MolarMass = 128.91 g mol<sup>−1</sup> | ||
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| − | '''Bromic acid''', HBrO<sub>3</sub>, is an [[oxoacid]] of [[bromine]]. | + | '''Bromic acid''', HBrO<sub>3</sub>, is an [[oxoacid]] of [[bromine]]. It is a [[strong acid]] that is only known in aqueous solution.<ref name="G&E"/><ref name="Kirk-Othmer">{{Kirk-Othmer | first1 = S. D. | last1 = Ukeles | first2 = M. | last2 = Freiberg | contribution = Bromine, Inorganic Compounds | doi = 10.1002/0471238961.021815131001031 | year = 2002}}.</ref> |
| + | |||
| + | ==Preparation== | ||
| + | Bromic acid may be prepared by | ||
| + | *reaction of [[sulfuric acid]] with a [[bromate]] (e.g., [[barium bromate]]);<ref name="Kirk-Othmer"/> | ||
| + | *[[electrolysis]] of a solution of [[bromine]] with [[platinum]] or [[lead dioxide]] [[anode]]s;<ref>{{citation | first1 = V. I. | last1 = Bogatyrev | first2 = A. I. | last2 = Vulikh | journal = J. Appl. Chem. USSR | volume = 36 | pages = 205 | year = 1963}}.</ref> | ||
| + | *passage of a solution of an alkali bromate through a column of acid [[ion-exchange polymer]].<ref>{{citation | inventor1-first = D. | inventor1-last = Robertson | assignee = Arapahoe Chemicals Inc. | title = Bromic acid process for the preparation of certain aliphatic n-bromo compounds | country-code = US | patent-number = 3187044 | publication-date = 1965-06-01}}.</ref> | ||
| + | The solutions can be concentrated under reduced pressure up to a [[mass fraction]] of HBrO<sub>3</sub> of about 50%, which corresponds approximately to the composition HBrO<sub>3</sub>·7H<sub>2</sub>O. Higher concentrations decompose with the release of [[oxygen]]: the 50% solution is stable to about 40 °C:<ref name="G&E"/><ref name="Kirk-Othmer"/> | ||
| + | :4 HBrO<sub>3</sub> → 2 Br<sub>2</sub> + 5 O<sub>2</sub> + 2 H<sub>2</sub>O | ||
==Notes and references== | ==Notes and references== | ||
Latest revision as of 14:44, 2 January 2011
| Bromic acid | |
|---|---|
| IUPAC name | Bromic acid[note 1] |
| Other names | Bromic(V) acid Hydroxy-λ5-bromanedione Hydroxidodioxidobromine |
| Identifiers | |
| InChI | InChI=1/BrHO3/c2-1(3)4/h(H,2,3,4) |
| InChIKey | SXDBWCPKPHAZSM-UHFFFAOYAE |
| Standard InChI | InChI=1S/BrHO3/c2-1(3)4/h(H,2,3,4) |
| Standard InChIKey | SXDBWCPKPHAZSM-UHFFFAOYSA-N |
| CAS number | [] |
| EC number | |
| ChemSpider | |
| Properties[2] | |
| Chemical formula | HBrO3 |
| Molar mass | 128.91 g mol−1 |
| Acidity (pKa) | < 0 |
| Related compounds | |
| Other halic acids | Chloric acid Iodic acid |
| Other compounds | Hydrobromic acid Hypobromous acid Bromous acid Perbromic acid |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Bromic acid, HBrO3, is an oxoacid of bromine. It is a strong acid that is only known in aqueous solution.[2][3]
Preparation
Bromic acid may be prepared by
- reaction of sulfuric acid with a bromate (e.g., barium bromate);[3]
- electrolysis of a solution of bromine with platinum or lead dioxide anodes;[4]
- passage of a solution of an alkali bromate through a column of acid ion-exchange polymer.[5]
The solutions can be concentrated under reduced pressure up to a mass fraction of HBrO3 of about 50%, which corresponds approximately to the composition HBrO3·7H2O. Higher concentrations decompose with the release of oxygen: the 50% solution is stable to about 40 °C:[2][3]
- 4 HBrO3 → 2 Br2 + 5 O2 + 2 H2O
Notes and references
Notes
- ↑ Bromic acid is a retained name in IUPAC nomenclature.[1]
References
- ↑ Nomenclature of Inorganic Chemistry; IUPAC Recommendations 2005; Royal Society of Chemistry: Cambridge, 2005; p 287. ISBN 0-85404-438-8, <http://www.iupac.org/publications/books/rbook/Red_Book_2005.pdf>.
- ↑ 2.0 2.1 2.2 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1009–13. ISBN 0-08-022057-6.
- ↑ 3.0 3.1 3.2 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.
- ↑ Bogatyrev, V. I.; Vulikh, A. I. J. Appl. Chem. USSR 1963, 36, 205.
- ↑ Robertson, D. (Arapahoe Chemicals Inc.) Bromic acid process for the preparation of certain aliphatic n-bromo compounds. US Patent 3187044, published 1 June 1965.
External links
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See also the corresponding article on Wikipedia. |
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