Ascorbic acid (vitamin C) is a water-soluble vitamin. It occurs as a white or slightly yellow crystal or powder with a slight acidic taste. It is an antiscorbutic product. On exposure to light, it gradually darkens. In the dry state, it is reasonably stable in air, but in solution it rapidly oxidizes. Ascorbic acid (vitamin c) is freely soluble in water; sparingly soluble in alcohol; insoluble in chloroform, in ether, and in benzene.

Melting point     191 ℃  ~  192℃
Heavy metals     ≤0.0003%
Assay (as C 6H 8O6, %)     99.0  ~  100.5
Loss   on drying     ≤0.1%
Sulphated ash     ≤ 0.1%