THEORETICAL-STUDY OF THE REDOX AND ACID-BASE EQUILIBRIA OF 2,6-DICHLOROINDOPHENOL IMMOBILIZED ON AMBERLITE XAD-4

By using three equations, viz., the Nernst equation, the acid-base dis sociation constant equation and the equation for the Kubelka-Munk func tion for reflectance, an equation describing the redox behaviour of th e immobilised indicator 2,6-dichloroindophenol has been formulated. Af ter determination of the acid dissociation constant of the reduced for m of the indicator, theoretical responses were calculated and compared to the experimental responses. The results indicate that the redox eq uilibrium involves a one-electron transfer in the pH range 2 to 5.