Acetylsalicylic acid CAS NO.50-78-2

Formula C9H8O4 M.W. 180.16 Chemical Name Acetyl Salicylic Acid. Technical Information Colourless crystals or white crystalline powder or granules, Orthorhombic and triclinic crystals. Od…

Formula C9H8O4 M.W. 180.16 Chemical Name Acetyl Salicylic Acid. Technical Information Colourless crystals or white crystalline powder or granules, Orthorhombic and triclinic crystals. Odourless. In the presence of moist air gradually hydrolysed into Salicylic Acid and Acetic Acid. 1gm. dissolves in 300ml. of water at 25oC, in 100ml of water at 37oC, in 5ml of alcohol, 17ml of chloroform, 10-15ml of ether. Typical Analysis Description Crystals - Colourless crystals. Crystal Fines - Colourless small crystals. Powder - White crystalline powder. Granules - White granules. Odour Odourless or almost Odourless Melting Point About 143 0 C (Instantaneous method). Reaction A 10% w/v solution is acid to solution of methyl red. Clarity and colour of Solution in Ethanol Passes Test. Related Substance 1000 ppm (max.) B.P. Limit/0.25% E.P. Organic Volatile Impurities Passes Test. Arsenic 2ppm (max.). Heavy Metals 10 ppm (max.) U.S.P./20ppm (max.) I.P./B.P./E.P. Chloride 0.014% (max.) U.S.P./0.043% (max.) I.P. Sulphate 0.040% (max.) U.S.P./0.06% (max.) I.P. Salicylic Acid 0.05% (max.) B.P./0.10% (max.) I.P./U.S.P./E.P. Readily Carbonisable Substance 0.5g dissolved in 10ml of cold H2SO4 (94.5-95.5% w/w) produces not more than a faint yellow colour. Substance Insoluble in Sod.carbonate solution(10.5% w/v) 1g dissolved in 20ml of Sodium carbonate is clear. Loss on drying 0.50% (max.) when dried over Phosphorous Pentoxide at a pressure 1.5 to 2.5k Pa. Sulphated ash 0.1% (max.) I.P./B.P./E.P. Residue on ignition 0.05% (max.) U.S.P. Assay 99.5% (min) of C9H8O4.calculated with reference to the dried substance. Screen analysis Crystals 30% to 45% retention on 40 Mesh as per requirement from customers. Crystal Fines 5% (min) retention on 40 M. 55% (min) retention on 120 M. Powder 20% (max) retention on 100 M. Granules 65% (min) retention on 40 M. 90% (min) retention on 120 M. (40 Mesh = 420 Microns) (120 Mesh = 120 Microns)