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Strontium iodide

Strontium iodide

General
Systematic name	Strontium iodide
Molecular formula	SrI₂ (anhydrous) SrI₂·6H₂O (hexahydrate)
Molar mass	341.43 g/mol (anhydrous)
Appearance	Colorless to white crystalline plates
CAS number	[10476-86-5]
Properties
Density and phase	5.459 g/cm³ (anhydrous) 4.415g/cm³ (hexahydrate)
Solubility	64.0 g/100 ml (20°C) in water 3.1 g/100 ml (4°C) in ethanol^[1]
Melting point	507-645°C (decomposes)^[2]
Structure
Crystal structure	Hexagonal
Hazards
Main hazards	Corrosive
R/S statement	R: R14 R34 S: S22 S26 S27 S36/37/39 S45^[3]
RTECS number	WK9275000
Related compounds
Other anions	strontium fluoride strontium chloride strontium bromide
Other cations	calcium iodide barium iodide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Strontium iodide (SrI₂) is a salt of strontium and iodine. It is an ionic, water-soluble, and deliquescent compound that can be used in medicine as a substitute for potassium iodide ^[4].

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Reactions

Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:

SrCO₃ + 2 HI → SrI₂ + H₂O + CO₂

Strontium iodide yellows when exposed to air. At high temperatures, strontium iodide decomposes to strontium oxide and free iodine^[5].

References

^ Seidell, Atherton (1907), , New York: D. Van Nostrand, pp. 318, . Retrieved on 2007-12-10
^ Turner, Jr., Francis M., ed. (1920), , New York: The Chemical Catalog Company, pp. 449, . Retrieved on 2007-12-10
^ http://www.sigmaaldrich.com/catalog/search/ProductDetail/ALDRICH/400696
^ Shoemaker, John V. (1908), (Seventh ed.), Philadelphia: F. A. Davis, pp. 854, . Retrieved on 2007-12-10
^ Bartley, Elias H. (1898), (Fifth ed.), Philadelphia: P. Blakiston, pp. 267-268, . Retrieved on 2007-12-10