Iodic acid

Structural formula
General
Surname	Iodic acid
other names	Iodine (III) acid
Molecular formula	HIO 2
Brief description	not purely representable
External identifiers / databases
CAS number 12134-99-5 EC number 235-218-7 ECHA InfoCard 100.032.004 PubChem 166623 Wikidata Q425018
properties
Molar mass	159.98 g mol −1
solubility	only stable in aqueous solution
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Iodic acid is an oxygen acid of iodine in which it occurs in the + III oxidation state . Their salts are called iodites . It is the last and most unstable representative in the series of halogenated oxygen acids . Little is currently known about iodine acid. It cannot be isolated and, even in aqueous solution, is only a very reactive intermediate , which is formed, for example, in the disproportionation of hypoiodous acid in sodium hydroxide solution (in the form of its acid residue ):

${\displaystyle \mathrm {2\ HOI\ +\ 2\ OH^{-}\longrightarrow IO_{2}^{-}\ +\ I^{-}\ +\ 2\ H_{2}O} }$

Iodous acid disproportionates rapidly to hypoiodous acid and iodic acid, even at temperatures around 0  ° C :

${\displaystyle \mathrm {2\ HIO_{2}\longrightarrow HIO\ +\ HIO_{3}} }$

Individual evidence

1. ^ ^{A b c} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 475.
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.