Iodic acid

Iodic acid
Ball-and-stick model of iodic acid	Space-filling model of iodic acid
Names
	Other names Iodic(V) acid
Identifiers
CAS Number	7782-68-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:24857 ;
ChEMBL	ChEMBL1161636 ;
ChemSpider	22761 ;
ECHA InfoCard	100.029.056
PubChem CID	24345;
UNII	6U8J18JSBM ;
CompTox Dashboard (EPA)	DTXSID2064812 ;
	InChI InChI=1S/HIO3/c2-1(3)4/h(H,2,3,4) Key: ICIWUVCWSCSTAQ-UHFFFAOYSA-N ; InChI=1/HIO3/c2-1(3)4/h(H,2,3,4) Key: ICIWUVCWSCSTAQ-UHFFFAOYAT;
	SMILES O[I+2]([O-])[O-];
Properties
Chemical formula	HIO3
Molar mass	175.91 g/mol
Appearance	White solid
Density	4.62 g/cm3, solid
Melting point	110 °C (230 °F; 383 K)
Solubility in water	269 g/100 mL (20 °C)
Acidity (pKa)	0.75
Conjugate base	Iodate
Magnetic susceptibility (χ)	−48.0·10−6 cm3/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	acid, corrosive, oxidant
	GHS labelling:
Pictograms
Signal word	Danger
NFPA 704 (fire diamond)	3 0 1 OX
Flash point	Non-flammable
Related compounds
Other cations	Lithium iodate; Potassium iodate
Related halogen oxoacids	Chloric acid; Bromic acid
Related compounds	Hydroiodic acid; Iodine pentoxide; Periodic acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iodic acid is a white water-soluble solid with the chemical formula HIO₃. Its robustness contrasts with the instability of chloric acid and bromic acid. Iodic acid features iodine in the oxidation state +5 and is one of the most stable oxo-acids of the halogens. When heated, samples dehydrate to give iodine pentoxide. On further heating, the iodine pentoxide further decomposes, giving a mix of iodine, oxygen and lower oxides of iodine.

^ Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2^nd ed.). Oxford: Pergamon (published 1984). Entry 127. ISBN 0-08-029214-3. LCCN 82-16524.
^ "Iodic acid" (PDF).

[P82db-1] Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2^nd ed.). Oxford: Pergamon (published 1984). Entry 127. ISBN 0-08-029214-3. LCCN 82-16524.

[2] "Iodic acid" (PDF).

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