On the basis of reducing property of ascorbic acid, it can be determined chemically by titrating against an oxidizing agent such as 2,6-dichlorophenolindole dye Indian Pharmacopoeia, It is not applicable to many pharmaceutical preparations containing Fe (II), Sn (II), Cu (I), SO2, SO32- and S2O32- ions which are usually associated with mineral or liver preparations. The method is applicable only when the concentration of dehydroascorbic acid is negligible. The applicability of the method is restricted to only those samples of citrous fruits and multivitamin tables, which do not contain minerals.