The iodite ion, or iodine dioxide anion, is the halite with the chemical formula IO−2. Within the ion the Iodine exists in the oxidation state of +3.
Iodites (including iodous acid) are highly unstable and have been observed[1] but never isolated.[citation needed] They will rapidly disproportionate to molecular Iodine and Iodates.[2] However, they have been detected as intermediates in the conversion between iodide and iodate.[3][4]
Iodous acid is acid form of the iodite ion, with the formula HIO2.
Iodine can assume oxidation states of −1, +1, +3, +5, or +7. A number of neutral iodine oxides are also known.
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