Calcium iodide hydrate (CaI2•xH2O)-Crystalline

Characteristic

 

Calcium iodide (chemical formula CaI₂) is the ionic compound of calcium and iodine. This colourless deliquescent solid is a salt that is highly soluble in water. Its properties are similar to those for related salts, such as calcium chloride. 

Chemical formula：CaI₂

Molar mass：293.887 g/mol (anhydrous);365.95 g/mol (tetrahydrate)

Appearance：white solid

Density：3.956 g/cm³ (anhydrous)

Melting point：779 °C (1,434 °F; 1,052 K) (anhydrous) 

Boiling point：1,100 °C (2,010 °F; 1,370 K) 

Solubility in water：64.6 g/100 mL (0 °C);66 g/100 mL (20 °C);81 g/100 mL (100 °C)

Solubility：soluble in acetone and alcohols

Magnetic susceptibility (χ)：-109.0·10⁻⁶ cm³/mol

Crystal structure：Rhombohedral, hP3

 

Application

 

Calcium iodide hydrate used in photography. It is also used in cat food as a source of iodine.