Characteristic
Magnesium bromide (MgBr2) is a chemical compound of magnesium and bromine that is white and deliquescent.
Chemical formula:MgBr2 (anhydrous);MgBr2·6H2O (hexahydrate)
Molar mass:184.113 g/mol (anhydrous);292.204 g/mol (hexahydrate)
Appearance:white hygroscopic hexagonal crystals (anhydrous) colorless monoclinic crystals (hexahydrate)
Density:3.72 g/cm3 (anhydrous);2.07 g/cm3 (hexahydrate)
Melting point:711 °C (1,312 °F; 984 K) 172.4 °C,decomposes (hexahydrate)
Boiling point:1,250 °C (2,280 °F; 1,520 K)
Solubility in water:102 g/100 mL (anhydrous);316 g/100 mL (0 °C, hexahydrate)
Solubility:ethanol: 6.9 g/100 mL
methanol: 21.8 g/100 mL
Magnetic susceptibility (χ):−72.0·10−6 cm3/mol
Application
Magnesium bromide hexahydrate is used as flame retardant. Used as source of magnesium ion and a co-factor for many enzymes including deoxyribonuclease (DNase) and various restriction enzymes.