Bromic acid

Bromic acid

Names
IUPAC name Bromic acid
Other names Bromic(V) acid Hydrogen bromate
Identifiers
CAS Number	7789-31-3 N[correct]
3D model (Jmol)	Interactive image Interactive image
ChEBI	CHEBI:49382 Y
ChEMBL	ChEMBL1161635 Y
ChemSpider	22853 Y
ECHA InfoCard	100.029.235
EC Number	232-158-3
Gmelin Reference	25861
MeSH	deez+noots
PubChem	24445
RTECS number	TP8580000
InChI InChI=1S/BrHO3/c2-1(3)4/h(H,2,3,4) Y Key: SXDBWCPKPHAZSM-UHFFFAOYSA-N Y InChI=1/BrHO3/c2-1(3)4/h(H,2,3,4) Key: SXDBWCPKPHAZSM-UHFFFAOYAE
SMILES O[Br](=O)=O O=Br(=O)O
Properties
Chemical formula	HBrO3
Molar mass	128.91 g/mol
Acidity (pKa)	−2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Bromic acid, also known as hydrogen bromate, is an oxoacid with the molecular formula HBrO₃. It only exists in aqueous solution. It is a colorless solution that turns yellow at room temperature as it decomposes to bromine. Bromic acid and bromates are powerful oxidizing agents and are common ingredients in Belousov-Zhabotinsky reactions. Belousov-Zhabotinsky reactions are a classic example of non-equilibrium thermodynamics.

Low concentrations dissociate completely to hydrogen 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.

There are several isomers of HBrO₃. The calculated bond lengths are listed below based on three high level theories G2MP2, CCSD(T), and QCISD(T).

The large energy barriers between these structures do not make isomerization possible. HOBrO₂ is the most stable isomer and is the one pictured above.

Bromic acid is the product of a reaction of barium bromate and sulfuric acid.

Barium sulfate is insoluble in water and forms a precipitate. The aqueous bromic acid can be decanted removing the barium sulfate.