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Colorimetric Determination Of Menadione Sodium Bisulphate With Chloranilic Acid

Author(s): U Ajali, G.B Okide, U.E Odo

Menadione sodium bisulphate was determined calorimetrically with chloranilic acid. It forms instantaneous purple charge transfer complex with chloranilic acid in ethanol-dioxan mixture, which had λmax at 510 nm. The complexation was maximum at room temperature and at 30 min after mixing the reactants. The molar absorptivity and association constant for the complex were determined to be 147.4 I/mol/cm and 1.32 l/mol, respectively. The standard free energy change for the complex was calculated to be 6.85 kcal/mol. The percentage recovery for the assay of the tablets was 97.6% while the experiment was obtainable at the concentration range of 0.2-1.1 mg% menadione sodium bisulphate.


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