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The iodate anion,
Space-filling model of the iodate anion

An iodate is a conjugate base of iodic acid.[1] In the iodate anion, iodine is bonded to three oxygen atoms and the molecular formula is . The molecular geometry of iodate is trigonal pyramidal.

Iodate can be obtained by reducing a periodate with a sulfide. The byproduct of the reaction is a sulfoxide.[2]

Iodates are a class of chemical compounds containing this group. Examples are sodium iodate (NaIO3), silver iodate (AgIO3), and calcium iodate (Ca(IO3)2). Iodates resemble chlorates with iodine instead of chlorine.

In acidic conditions, iodic acid is formed. Potassium hydrogen iodate (KH(IO3)2) is a double salt of potassium iodate and iodic acid and an acid as well. Iodates are used in the iodine clock reaction.

Potassium iodate, like potassium iodide, has been issued as a prophylaxis against radioiodine absorption in some countries.[3][4]

Other oxyanions

Iodine can assume oxidation states of -1, +1, +3, +5, or +7. A number of neutral iodine oxides are also known.

Iodine oxidation state -1 +1 +3 +5 +7
Name iodide hypoiodite iodite iodate periodate
Formula I- IO- or

Natural occurrence

Minerals containing essential iodate anions are very rare. They are almost exclusively known from the caliche deposits of Chile. The deposits stand for the main source of nitrates, but iodate- and chromate-bearing minerals are also present there. The most important iodate minerals are lautarite and brüggenite, but also copper-bearing iodates (e.g., salesite) are known. In the iodate minerals iodine is always pentavalent, i.e., present as the anions.[5]


  1. ^ Merriam-Webster definition
  2. ^ Qiu, Chao; Sheng Han; Xingguo Cheng; Tianhui Ren (2005). "Distribution of Thioethers in Hydrotreated Transformer Base Oil by Oxidation and ICP-AES Analysis" (abstract). Industrial & Engineering Chemistry Research. 44 (11): 4151-4155. doi:10.1021/ie048833b. Retrieved . Thioethers can be oxidized to sulfoxides by periodate, and periodate is reduced to iodate
  3. ^ "Archived copy". Archived from the original on 2013-10-17. Retrieved .CS1 maint: archived copy as title (link)
  4. ^
  5. ^

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