What's the Ammonium Bromide ?

What's the Ammonium Bromide ?

Chemical Formula: NH4Br M.W.: 97.94 EINECS No.:235-183-8
Application: Ammonium Bromide is used in the preparation of photographic emulsions and developers,in pharmaceutical preparations and paper industry,as a wood preservative,for water treatment and as a flame retardant additive.
CAS#：12124-97-9 HS NO.：28275900
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).

Ammonium bromide Chemical Formula

Ammonium bromide 3D balls

Preparation:
Ammonium bromide can be prepared by the direct action of hydrogen bromide on ammonia.
NH3 + HBr → NH4Br
It can also be prepared by the reaction of ammonia with iron(II) bromide or iron(III) bromide, which may be obtained by passing aqueous bromine solution over iron filings.
2 NH3 + FeBr2 + 2 H2O → 2 NH4Br + Fe(OH)2
Reactions:
Ammonium bromide is a weak acid with a pKa of ~5 in water. It is an acid salt because the ammonium ion hydrolyzes slightly in water.
Ammonium Bromide is strong electrolyte when put in water.:
NH4Br(s) → NH4+(aq) + Br−(aq)
Ammonium bromide decomposes to ammonia and hydrogen bromide when heated at elevated temperatures:
NH4Br → NH3 + HBr
Uses:
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.