Calcium chloride
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Calcium chloride

Molecular formula------CaCl2

                                CaCl2.2H2O [Dihydrate]

                                CaCl2.4H2O [Tetrahydrate]

                                CaCl2.6H2O [Hexahydrate]

Molar mass-------110.99 g/mol, [anhydrous]

                        147.02 g/mol, [dihydrate]

                        182.04 g/mol, [tetrahydrate]

                         219.08 g/mol, [hexahydrate]

Density------2.15 g/cm³, anhydrous

                 0.835 g/cm³, dihydrate

                 1.71 g/cm³, hexahydrate

Melting point------772 °C (anhydrous)

Boiling point------>1600 °C

Solubility in water------74.5 g/100 ml (20 °C)

Appearance:white or colorless solid

Calcium chloride, CaCl2, is a common salt. It behaves as a typical ionic halide, and is solid at room temperature. It has several common applications such as brine for refrigeration plants, ice and dust control on roads, and in concrete. The anhydrous salt is also widely used as a desiccant, where it will absorb so much water that it will eventually dissolve in its own crystal lattice water.