:Bromic acid
{{Chembox
| Verifiedfields = changed
| verifiedrevid = 477000756
| ImageFile1 = Bromic acid.svg
| ImageSize1 = 150px
| ImageName1 = Skeletal model of bromic acid
| ImageFile2 = Bromic-acid-3D-vdW.png
| ImageSize2 = 150px
| ImageName2 = Spacefill model of bromic acid
| IUPACName = Bromic acid
| OtherNames = Bromic(V) acid
Hydrogen bromate
|Section1={{Chembox Identifiers
| InChI = 1/BrHO3/c2-1(3)4/h(H,2,3,4)
| InChIKey = SXDBWCPKPHAZSM-UHFFFAOYAE
| SMILES1 = O=Br(=O)O
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo = 7789-31-3
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = 908X3OZ87J
| PubChem = 24445
| ChemSpiderID = 22853
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| EINECS = 232-158-3
| MeSHName = Bromic+acid
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 49382
| RTECS =
| SMILES = O[Br+2]([O-])[O-]
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 1161635
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/BrHO3/c2-1(3)4/h(H,2,3,4)
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = SXDBWCPKPHAZSM-UHFFFAOYSA-N
| Gmelin = 25861}}
|Section2={{Chembox Properties
| H=1 | Br=1 | O=3
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| ConjugateBase = Bromate
| pKa = −2
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|Section3={{Chembox Structure
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|Section7={{Chembox Hazards
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|Section8={{Chembox Related
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Bromic acid, also known as hydrogen bromate, is an oxoacid with the molecular formula HBrO3. It only exists in aqueous solution.The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals. 14th Edition. 2006.Van Nostrand's Scientific Encyclopedia. Glenn D. Considine. Ninth Edition. Volume 1. p 554 It is a colorless solution that turns yellow at room temperature as it decomposes to bromine.Recipes for Belousov–Zhabotinsky reagents. J. Chem. Educ., 1991, 68 (4), 320. doi:10.1021/ed068p320 Bromic acid and bromates are powerful oxidizing agents and are common ingredients in Belousov–Zhabotinsky reactions.The Source of the Carbon Monoxide in the Classical Belousov–Zhabotinsky Reaction. J. Phys. Chem. A., 2007, 111 (32), 7805–12 doi:10.1021/jp073512+ Belousov-Zhabotinsky reactions are a classic example of non-equilibrium thermodynamics.
Dissociation
Low concentrations dissociate completely to hydronium and bromate while high concentrations decompose to form bromine. Bromic acid's high instability can be explained because the positively charged hypervalent bromine is connected to the electronegative OH group.Theoretical investigation of halogen-oxygen bonding and its implications in halogen chemistry and reactivity. Bioinorganic Chemistry and Applications, 2007, 1, 11/1–11/9
Structure
There are several isomers of HBrO3.A Theoretical Examination of the Isomerization Pathways for HBrO3 Isomers. J. Phys. Chem. A, 2000, 104 (41), 9321-27. doi:10.1021/jp001604s The calculated bond lengths are listed below based on three high level theories G2MP2, CCSD(T), and QCISD(T).
class="wikitable" | ||||
Species | HOOOBr | HOOBrO | HOBrO2 | HBrO3 |
---|---|---|---|---|
Br–O bridged (Å) | 1.867 | 1.919 | 1.844 | — |
Br–O terminal (Å) | — | 1.635 | 1.598 | 1.586 |
The large energy barriers between these structures do not make isomerization possible. HOBrO2 is the most stable isomer and is the one pictured above.
Synthesis
References
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{{Hydrogen compounds}}
{{Bromine compounds}}
{{bromates}}
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