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An iodate is the polyatomic anion with the formula . It is the most common form of iodine in nature, as it comprises the major iodine-containing ores. Iodate salts are often colorless. They are the salts of iodic acid.
Iodate is Redox by sulfite:
Iodate is also obtained by reducing a periodate with a thioether. The byproduct of the reaction is a sulfoxide.
Natural waters contain iodine in the form of iodide and iodate, their ratio being dependent on redox conditions and pH. Iodate is the second most abundant form in water. It is mostly associated with alkaline waters and oxidizing conditions.
Iodate oxidizes iodide in acidic conditions:
Similarly, chlorate oxidizes iodide to iodate:
Acid-base
Iodate is unusual in that it forms a homoassociation:
The anion is referred to as biiodate.
Principal compounds
Natural occurrence
Minerals containing iodate are found in the caliche deposits of Chile. The most important iodate minerals are lautarite and brüggenite, but also copper-bearing iodates such as salesite are known.
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