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