Calcium iodate is any of two inorganic compounds with the formula Ca(IO3)2(H2O)x, where x = 0 or 1. Both are colourless salts that occur as the minerals lautarite and bruggenite, respectively. A third mineral form of calcium iodate is dietzeite, a salt containing chromate with the formula Ca2(IO3)2CrO4.[1] These minerals are the most common compounds containing iodate.

Calcium iodate
Names
IUPAC name
Calcium diiodate
Other names
Lautarite
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.265 Edit this at Wikidata
EC Number
  • 232-191-3
E number E916 (glazing agents, ...)
UNII
  • InChI=1S/Ca.2HIO3/c;2*2-1(3)4/h;2*(H,2,3,4)/q+2;;/p-2 checkY
    Key: UHWJJLGTKIWIJO-UHFFFAOYSA-L checkY
  • InChI=1/Ca.2HIO3/c;2*2-1(3)4/h;2*(H,2,3,4)/q+2;;/p-2
    Key: UHWJJLGTKIWIJO-NUQVWONBAT
  • [Ca+2].[O-]I(=O)=O.[O-]I(=O)=O
Properties
Ca(IO3)2
Molar mass 389.88 g/mol (anhydrous)
407.90 g/mol (monohydrate)
Appearance white solid
Density 4.519 g/cm3 (monohydrate)
Melting point 540 °C (1,004 °F; 813 K) (monohydrate)
Boiling point decomposes
0.09 g/100 mL (0 °C)
0.24 g/100 mL (20 °C)
0.67 g/100 mL (90 °C)
6.47×10−6
Solubility soluble in nitric acid
insoluble in alcohol
-101.4·10−6 cm3/mol
Structure
monoclinic (anhydrous)
cubic (monohydrate)
orthorhombic (hexahydrate)
Hazards
Flash point non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Production and uses

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Lautarite, described as the most important mineral source of iodine, is mined in the Atacama Desert.[1] Processing of the ore entails reduction of its aqueous extracts with sodium bisulfite to give sodium iodide. This comproportionation reaction is a major source of the sodium iodide.[1]

Calcium iodate can be produced by the anodic oxidation of calcium iodide or by passing chlorine into a hot solution of lime in which iodine has been dissolved.

Calcium iodate is used as an iodine supplement in chicken feed.[1] Ethylenediamine dihydroiodide (EDDI) is a more typical source of nutritional iodine.

References

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  1. ^ a b c d Lyday, Phyllis A.; Kaiho, Tatsuo (2015). "Iodine and Iodine Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. pp. 1–13. doi:10.1002/14356007.a14_381.pub2. ISBN 978-3527306732.