|
Appearance
|
A clear colourless liquid
|
|
Solubility
|
Miscible with water
|
|
Identification
|
-
|
|
By potassium permanganate
|
Chlorine should evolve
|
|
Reaction of chlorides reaction A
|
A curdy white precipitate should be formed which is insoluble in nitric acid but soluble, after being washed with water, in dilute ammonia solution, from which it is reprecipitated by the addition of dilute nitric acid
|
|
Reaction B
|
The paper should turn violet-red
|
|
Arsenic
|
NMT 0.5 ppm
|
|
Heavy metals
|
NMT 2 ppm
|
|
Free chlorine (CI)
|
Any blue colour produced which should disappear on the addition of 0.2 ml of 0.01M sodium thiosulphate
|
|
Residue on evaporation
|
NMT 0.01% (determined on 100 g of sample)
|
|
Sulphates
|
NMT 5 ppm
|
|
Assay (by titration)
|
9.5% – 10.5% w/w
|