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Calcium iodide

IUPAC name

calcium iodide

Identifiers

CAS number

10102-68-8

RTECS number

EV1300000

Properties

Molecular formula

CaI₂

Molar mass

293.89 g/mol, anhydrous

Appearance

white to light yellow solid

Density

3.956 g/cm³^[1]

Melting point

740 °C

Boiling point

1100 °C

Solubility in water

Hazards

NFPA 704

S-phrases

S24, S25, S28, S37, S45 ^[2]

Related Compounds

Other anions

calcium fluoride
calcium bromide
calcium chloride

Other cations

magnesium iodide
strontium iodide

Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Calcium iodide (CaI₂) is an ionic compound of calcium and iodine. It is highly soluble in water and it is deliquescent. It is a salt that is solid at room temperature, and it behaves as a typical ionic halide. Because of its hygroscopic nature, it must be kept in tightly-sealed containers. It is similar to calcium chloride in many respects^[3]. It is used in photography^[1].

Additional recommended knowledge

Reactions

Henri Moissan first isolated pure calcium metal by reducing calcium iodide with pure sodium metal^[4]:

Ca I₂ + 2Na → 2NaI + Ca

Calcium iodide can be formed by reacting calcium carbonate with hydroiodic acid^[5]:

CaCO₃ + 2HI → CaI₂ + H₂O + CO₂

Calcium iodide slowly reacts with oxygen and carbon dioxide in the air, giving free iodine^[6].

References

^ ^a ^b Turner, Jr., Francis M., ed., (First ed.), New York: The Chemical Catalog Company, pp. 127, . Retrieved on 12-8-07
^ http://www.sciencelab.com/xMSDS-Calcium_iodide-9923259
^ Mendeleyev, Dmitry Ivanovich & Kamensky, George, , New York: P. F. Collier, pp. 604, . Retrieved on 2007-12-08
^ Mellor, Joseph William, , New York: Longmans, Green, and Co, pp. 334, . Retrieved on 2007-12-08
^ Gooch, Frank Austin & Walker, Claude Frederic, , New York: Macmillan, pp. 340, . Retrieved on 2007-12-08
^ Jones, Harry Clary, , New York: Macmillan, pp. 365, . Retrieved on 2007-12-08