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).
1. Uses
Ammonium bromide(CAS.NO:12124-97-9) is used for photography in films, plates and papers;in corrosion inhibitors;in lithography and process engraving;in fireproofing of wood; and in pharmaceutical preparations.
2. Production
Ammonium bromide can 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 + H2O → 2 NH4Br + FeO
It can also be prepared by the action of hydrogen bromide on ammonia as following:
NH3 + HBr → NH4Br
3. Potential health effects
Inhalation: May be fatal if inhaled. May cause respiratory tract irritation.
Ingestion: Toxic if swallowed.
Skin :Toxic if absorbed through skin.
Eyes: May cause skin irritation. May cause eye irritation.
4. Safety Profile
Hazard Codes of Ammonium bromide (cas no.12124-97-9): Xn,Xi
Risk Statements: 22-36/37/38
R22: Harmful if swallowed.
R36/37/38: Irritating to eyes, respiratory system and skin.
Safety Statements: 22-24/25
S22: Do not breathe dust.
S24/25: Avoid contact with skin and eyes.
WGK Germany: 2
RTECS: BO9155000
Moderately toxic by ingestion and intraperitoneal routes. When heated to decomposition it emits very toxic fumes of NOx, Br−, and NH3. Incompatible with BrF3; IF7; K.
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