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Ammonium bromide

78.3 g/100 mL (25 °C) 145 g/100 mL (100 °C) | NFPA-H = 2 | NFPA-F = 0 | NFPA-R = 0 Ammonium chloride Ammonium iodide Potassium bromide

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 bromide (Br−) to bromine (Br2).

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 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: :NH4Br(s) → (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.

References

References

  1. {{Sigma-Aldrich
  2. Pradyot Patnaik. ''Handbook of Inorganic Chemicals''. McGraw-Hill, 2002, {{ISBN. 0-07-049439-8
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ammonium-compounds bromides nonmetal-halides
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