Ascorbic acid,Vitamin c

Ascorbic acid(vitamin c),meets the requirements of British Pharmacopoeia 2005, United States Pharmacopoeia 30 and the specification is following: Characteristics White crystals or crystalline powder Identification Positive Clarity of Solution Clear Colour of Solution £BY7. Melting Point 191-192 oC. Assay 99.0-100.0% Acidity (pH) 2.22.5 Sulphated Ash £0.1% Residue on Ignition £0.1% Specific Rotation (at temperature 25) +20.50+21.50 Heavy Metals £0.0003%. Oxalic Acid £0.2% Copper (%) £0.0005%. Iron (%) £0.0002% Organic Volatile Impurities Meets USP 29 stipulation Acidity(pH) 2.4 2.8 (2% aqueous solution) Loss on Drying £0.4% Arsenic £0.0003% Lead £0.0002% Mercury £0.0001%