A sImple, accurate and sensitive spectrophotometric method for the determination of Dapsone has been developed. The method is based on the charge transfer complex formation reaction of dapsone as n-donors with o-chloranil (o-CA) as π-acceptor in aqueous medium forming colored complex with maximum absorption at 394 nm. Beer's law was obeyed in concentration ranges of 0.125-1.25 µg/ml with molar absorptivity 1.092×10 5 l. mol -1 .cm -1 . The accuracy of the method (average recovery %) was 100.34%

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... and precision (RsD) ≤ 3.91 %. The results show that complex is formed in ratio 1:2 with the stability constant 3.81×10 9 l 2 .mol -2 . The suggested method was applied successfully to determine Dapsone in its pharmaceutical preparation.