Calcium iodate

Calcium iodate
Names
	IUPAC name Calcium diiodate
	Other names Lautarite
Identifiers
CAS Number	7789-80-2 (anhydrous) ; 10031-33-1 (hexahydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	23021 ;
ECHA InfoCard	100.029.265
EC Number	232-191-3;
E number	E916 (glazing agents, ...)
PubChem CID	24619;
UNII	L8MN4Y57BR (anhydrous) ;
CompTox Dashboard (EPA)	DTXSID40960972 ;
	InChI InChI=1S/Ca.2HIO3/c;22-1(3)4/h;2(H,2,3,4)/q+2;;/p-2 Key: UHWJJLGTKIWIJO-UHFFFAOYSA-L ; InChI=1/Ca.2HIO3/c;22-1(3)4/h;2(H,2,3,4)/q+2;;/p-2 Key: UHWJJLGTKIWIJO-NUQVWONBAT;
	SMILES [Ca+2].[O-]I(=O)=O.[O-]I(=O)=O;
Properties
Chemical formula	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
Solubility in water	0.09 g/100 mL (0 °C) ; 0.24 g/100 mL (20 °C) ; 0.67 g/100 mL (90 °C)
Solubility product (Ksp)	6.47×10−6
Solubility	soluble in nitric acid ; insoluble in alcohol
Magnetic susceptibility (χ)	-101.4·10−6 cm3/mol
Structure
Crystal 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). verify (what is ?) Infobox references

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.

Production and uses

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

^ ^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.

[Ullmann-1] 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.

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