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Hypoiodous acid

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Title: Hypoiodous acid  
Author: World Heritage Encyclopedia
Language: English
Subject: Periodic acid, Iodous acid, Iodine monobromide, Iodine trifluoride, Thiocarbonic acid
Collection: Hydrogen Compounds, Iodine Compounds, Oxidizing Acids, Oxidizing Agents
Publisher: World Heritage Encyclopedia

Hypoiodous acid

Hypoiodous acid
CAS number  N
ChemSpider  YesY
Jmol-3D images Image 1
Molecular formula HIO
Molar mass 143.89 g/mol
Appearance ?
Density ?
Melting point ?
Boiling point ?
Solubility in water ?
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N   YesY/N?)

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
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