Sodium Chloride

SL. NO	TESTS			STANDARDS
1	Characters
	A	Description		White or colourless crystals or a white crystalline powder.
	B	Solubility		Freely soluble in water and slightly more soluble in boiling water; practically insoluble in ethanol.
2	Identification
	A	Reaction of Sodium salts
		i	Reaction A	A dense white precipitate should be formed.
		ii	Reaction B	No precipitate should be formed.
	B	Reaction of Chlorides
		i	Reaction A	A curdy white precipitate should be formed which should be insoluble in nitric acid but soluble in dilute ammonia solution.
		ii	Reaction B	The filter paper strip should turn violet-red.
3	Appearance of Solution			Solution should be Clear and Colourless
4	Acidity or Alkalinity			Not more than 0.5 ml of 0.01M hydrochloric acid or 0.01M sodium hydroxide should be required.
5	Arsenic			Not more than 1ppm.
6	Barium			No turbidity should be produced within 2 hours.
7	Bromide			Not more than 100 ppm
8	Calcium & Magnesium			Not more than 50 ppm.
9	Ferrocyanide			No blue colour should be produced within 10 minutes.
10	Heavy Metals			Not more than 5 ppm.
11	Iodide			The substance should not show blue colour after 5 minutes.
12	Iron			Not more than 20 ppm.
13	Sulphate			Not more than 300 ppm.
14	Loss on Drying			Not more than 1.0%
15	Assay			Between 99.0% and 100.5%