Characteristic

Ammonium bromide, NH4Br, is the ammonium salt of hydrobromic acid. The chemical crystallizes in colorless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water. On exposure to air it gradually assumes a yellow color because of the oxidation of traces of bromide (Br−) to bromine (Br₂).

Chemical formula：NH₄Br

Molar mass：97.94 g/mol

Appearance：white powder, hygroscopic

Density：2.429 g/cm³

Melting point：235 °C (455 °F; 508 K)

Boiling point：452 °C (846 °F; 725 K)

Solubility in water：60.6 g/100 mL (0 °C)；78.3 g/100 mL (25 °C)；145 g/100 mL (100 °C)

Magnetic susceptibility (χ)：−47.0•10−6 cm³/mol

Refractive index (nD)：1.712

Application

Ammonium bromide is used in pharmaceuticals for its bromide ion. It is used for a variety of analytical chemistry applications. It is also used for photography in films, plates and papers; in fireproofing of wood; in lithography and process engraving and as corrosion inhibitors.