Vitamin C (Ascorbic Acid)

Vitamin C (Ascorbic Acid)Item                                                                   Specification
Characteristics                                       White or almost white crystals, Crystalline powder
Identification                                           Positive reaction
Assay                                                        99.0%-100.5%
Melting point                                           About 190oC
pH (with 2% water solution)                    2.4-2.8
pH (with 5% water solution)                    2.1-2.6
Clarity of Solution                                    Clear
Color of Solution                                       ≤ BY7
Loss on drying                                           ≤ 0.4%
Oxalic acid                                                 ≤ 0.2%
Impurity E                                                  ≤ 0.2%
Sulphate Ash (Residue on Ignition)         ≤ 0.1%
Specific Optical Rotation                         +20.5o  –  +21.5o