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.