Hypoiodous acid

Hypoiodous acid

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Names
IUPAC name Hypoiodous acid
Other names Hypoiodous acid
Identifiers
CAS Number	14332-21-9 N
ChEBI	CHEBI:29231 Y
ChemSpider	109942 Y
Jmol 3D model	Interactive image
PubChem	123340
InChI InChI=1S/HIO/c1-2/h2H Y Key: GEOVEUCEIQCBKH-UHFFFAOYSA-N Y
SMILES IO
Properties
Chemical formula	HIO
Molar mass	143.89 g/mol
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Hypoiodous acid is the inorganic compound with the chemical formula HIO. It forms when an aqueous solution of iodine is treated with mercuric or silver salts. It rapidly decomposes by disproportionation:

5 HIO → HIO₃ + 2I₂ + 2H₂O

Hypoiodous acid is a weak acid with a pK_a of about 11. The conjugate base is hypoiodite (IO⁻). Salts of this anion can be prepared by treating I₂ with alkali hydroxides. They rapidly disproportionate to form iodides and iodates.