Iodic acid

Template:Chembox header | Iodic acid
Iodic acid Ball-and-stick model of iodic acid Space-filling model of iodic acid
Template:Chembox header | General
Other names	Iodic(V) acid
Molecular formula	HIO3
Molar mass	175.91 g/mol
Appearance	white solid
CAS number	[7782-68-5]
Template:Chembox header | Properties
Density and phase	4.62 g/cm3, solid
Solubility in water	269 g/100 ml (20 °C)
Melting point	110 °C
Boiling point	? °C (? K)
Acidity (pKa)	0.75
Template:Chembox header | Structure
Molecular shape	?
Dipole moment	? D
Template:Chembox header | Hazards
MSDS	External MSDS
EU classification	not listed
NFPA 704
Flash point	non flammable
Template:Chembox header | Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Template:Chembox header | Related compounds
Other anions	Hydriodic acid Periodic acid
Other cations	Potassium iodate
Related oxoacids	Chloric acid Bromic acid
Related compounds	Iodine pentoxide
Template:Chembox header | Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Iodic acid, HIO₃, can be obtained as a white solid. It is an isolable compound, unlike chloric acid or bromic acid.

Preparation

Iodic acid can be produced by oxidizing I₂ with chlorine in an aqueous solution

Properties

Iodic acid is a relatively strong acid with a pK_a of 0.75. It is strongly oxidizing in acidic solution, less so in basic solution.

Uses

Iodic acid is used as a standard strong acid in analytical chemistry. It may be used to standardize solutions of both weak and strong bases, with methyl red or methyl orange as the indicator.