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Calcium iodate

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Title: Calcium iodate  
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Subject: Ethylenediamine dihydroiodide, Calcium sulfite, Calcium bisulfite, Calcium borate, Calcium silicide
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Calcium iodate

Calcium iodate
CAS number  N, (anhydrous)
10031-33-1 (hexahydrate)
ChemSpider  YesY
Jmol-3D images Image 1
Molecular 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 soluble in nitric acid
insoluble in alcohol
Crystal structure monoclinic (anhydrous)
cubic (monohydrate)
orthorhombic (hexahydrate)
EU Index not listed
Flash point non-flammable
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N   YesY/N?)

Calcium iodateis an calcium dication and iodate anion. It is a colourless salt that occurs naturally as the mineral called lautarite, which is found in the Atacama Desert in Chile.[1]

Production and reactions

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


The mineral a commercially useful precursor to iodine. Processing of the ore entails reduction of its aqueous extracts with sodium bisulfite to give sodium iodide. Via a comproportionation reaction, the sodium iodide is combined with the iodate salt to produce elemental iodine.[1]

Calcium iodate can also be used as an iodine supplement in chicken feed.[1]

Calcium iodate is also added to lotions and ointments as an antiseptic and deodorant.[2]


  1. ^ a b c Lyday, Phyllis A. "Iodine and Iodine Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim, ISBN 978-3-527-30673-2 doi:10.1002/14356007.a14_381 Vol. A14 pp. 382–390.
  2. ^ Calcium iodate from the Online Medical Dictionary
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