Ammonium bromide

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 bromide (Br−) to bromine (Br2).

Ammonium bromide is a weak acid with a pKa of approximately 9 in water.

It is an acid salt because the ammonium ion hydrolyzes slightly in water.

Ammonium bromide is a strong electrolyte when put in water: Ammonium bromide decomposes to ammonia and hydrogen bromide when heated at elevated temperatures: Ammonium bromide is used for photography in films, plates and papers; in fireproofing of wood; in lithography and process engraving; in corrosion inhibitors; and in pharmaceutical preparations.

ball-and-stick model of an ammonium cation (left) and a bromide anion (right)
ball-and-stick model of an ammonium cation (left) and a bromide anion (right)
NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code