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| Names | |||
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| IUPAC name iodous acid | |||
| Identifiers | |||
3D model (JSmol) | |||
| ChemSpider | |||
| ECHA InfoCard | 100.032.004 | ||
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| Properties | |||
| HIO2 | |||
| Molar mass | 159.911 | ||
| Conjugate base | Iodite | ||
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |||
Iodous acid is thechemical compound with theformula HIO2. Itssalts are namediodites; these are exceedingly unstable and have been observed but never isolated.[1] They will rapidly disproportionate to moleculariodine andiodates.
Iodous acid is part of a series ofoxyacids in which iodine can assumeoxidation states of −1, +1, +3, +5, or +7. A number of neutraliodine oxides are also known.
| Iodine oxidation state | −1 | +1 | +3 | +5 | +7 |
|---|---|---|---|---|---|
| Name | Hydrogen iodide | Hypoiodous acid | Iodous acid | Iodic acid | Periodic acid |
| Formula | HI | HIO | HIO2 | HIO3 | HIO4 or H5IO6 |
