Glacial Acetic Acid, Certifiacation : ISO 9001

Cas number: 64-19-7, molecular weight: 60.05, chemical formula: ch3co2h , einecs ec number: 200-580-7, fema: 2006,
glacial acetic acid bp grade
ph eur -- c2h4o2 -- 60.1 -- 64-19-7
definition
content: 99.0 per cent mm to 100.5 per cent mm.
Characters
appearance: crystalline mass or clear, colourless, volatile liquid.
Solubility: miscible with water, with ethanol (96 per cent) and with methylene chloride.
Identification
a. A 100 gl solution is strongly acid (2.2.4).
B. To 0.03 ml add 3 ml of water r and neutralise with dilute sodium hydroxideâ solution r. The solution gives reaction (b) of acetates (2.3.1).
Tests
solution s: dilute 20 ml to 100 ml with distilled water.
Appearance: the substance to be examined is clear and colourless.
Freezing point: minimum 14.8c.
Reducing substances: to 5.0 ml add 10.0 ml of water and mix. To 5.0 ml of this solution add 6 ml of sulfuric acid, cool and add 2.0 ml of 0.0167 m potassium dichromate. Allow toâ stand for 1 min and add 25 ml of water and 1 ml of a freshly prepared 100 glâ solution of potassium iodide. Titrate with 0.1 m sodium thiosulfate, using 1.0 ml ofâ starch solution as indicator. Not less than 1.0 ml of 0.1 m sodium thiosulfateâ solution is required.
Chlorides: maximum 25 mgl.
Sulfates: maximum 50 mgl, determined on solution s.
Iron: maximum 5 ppm.
Heavy metals: â maximum 5 ppm.
Residue on evaporation: maximum 0.01 per cent.
Evaporate 20 g to dryness on a water-bath and dry at 100-105 â°c. The residueâ weighs a maximum of 2.0 mg.
Assay: weigh accurately a conical flask with a ground-glass stopper containing 25 ml ofâ water r. Add 1.0 ml of the substance to be examined and weigh again accurately.â add 0.5 ml of phenolphthalein solution r and titrate with 1 m sodium hydroxide.
1 ml of 1 m sodium hydroxide is equivalent to 60.1 mg of c2h4o2.