Ammonium Bromide

Ammonium Bromide

Specifications of Commercial Pure Ammonium Bromide:

Appearance: White Crystals
Assay: 98.5% min (also offered 99.5% min)
Loss on Drying: 0.5%
PH of 5% aqueous solution: 4.5 to 6
Arsenic(as As): 3ppm max

DEFINITION

Content
Ammonium Bromide 98.5 per cent to 100.5 per cent (dried substance).

CHARACTERS
Appearance
Ammonium Bromide is white or almost white, crystalline powder or colourless crystals, hygroscopic.
Solubility
Freely soluble in water, sparingly soluble in alcohol. It becomes yellow when exposed to light or air.

IDENTIFICATION
A. It gives reaction of bromides.
B. 10 ml of solution S (see Tests) gives the reaction of ammonium salts.

TESTS
Solution S Dissolve 10.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.
Appearance of solution Solution S is clear and colourless.
Acidity or alkalinity To 10 ml of solution S add 0.05 ml of methyl red solution. Not more than 0.5 ml of 0.01 M hydrochloric acid or 0.01 M sodium hydroxide is required to change the colour of the indicator.
Bromates To 10 ml of solution S add 1 ml of starch solution, 0.1 ml of a 100 g/l solution of potassium iodide and 0.25 ml of 0.5 M sulphuric acid and allow to stand protected from light for 5 min. No blue or violet colour develops.
Chlorides: Maximum 0.6 per cent.
Iodides To 5 ml of solution S add 0.15 ml of ferric chloride solution and 2 ml of methylene chloride. Shake and allow to separate. The lower layer is colourless.
Sulphates Maximum 100 ppm.
Iron Maximum 20 ppm.
Magnesium and alkaline-earth metals Maximum 200 ppm, calculated as Ca
Heavy metals Maximum 10 ppm.
Loss on drying Maximum 1.0 per cent, determined on 1.000 g by drying in an oven at 100-105C
Sulphated ash Maximum 0.1 per cent, determined on 1.0 g.