NH4Br - 97.9 - 12124-97-9
Ammonium Bromide
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.
