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Iodic acid

Iodic acid



Other names	Iodic(V) acid
Identifiers
CAS number	7782-68-5
Properties
Molecular formula	HIO₃
Molar mass	175.91 g/mol
Appearance	white solid
Density	4.62 g/cm³, solid
Melting point	110 °C
Solubility in water	269 g/100 ml (20 °C)
Acidity (pK_a)	0.75
Hazards
EU classification	not listed
Flash point	non flammable
Related Compounds
Other anions	Hydriodic acid Periodic acid
Other cations	Potassium iodate
Related oxoacids	Chloric acid Bromic acid
Related compounds	Iodine pentoxide
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 insoluble compound, unlike chloric acid or bromic acid.

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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.