Hypoiodous acid

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Hypoiodous acid
Hypoiodous-acid-3D-vdW.png Hypoiodous-acid-3D-balls.png
CAS number 14332-21-9 N
PubChem 123340
ChemSpider 109942 YesY
ChEBI CHEBI:29231 YesY
Jmol-3D images Image 1
Molecular formula HIO
Molar mass 143.89 g/mol
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Except where noted otherwise, 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:[1]

5 HIO → HIO3 + 2I2 + 2H2O

Hypoiodous acid is a weak acid with a Ka of about 10−11. 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.[1]


  1. ^ a b Egon Wiberg, Arnold Frederick Holleman (2001) Inorganic Chemistry, Elsevier ISBN 0-12-352651-5