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A buffer mixture consisting of equal molalities ( m ) of potassium dihydrogen phosphate and sodium succinate is proposed as a useful reference point in the study of acid-base equilibria, bridging the present gap between p H 5.5 and p H 6.8. The p (a H  γ  Cl ) at 25 °C has been determined by electromotive-force measurements for five buffer solutions in which m varied from 0.005 to 0.025. The conventional pa  H of each solution has been derived and found to be in good agreement with that calculated from existing data for the two equilibria concerned. The pa  H varies from 6.251 at m =0.005 to 6.109 at m = 0.025. The buffer mixture has been used successfully for the determination of the dissociation constants of 2-nitro-4-chlorophenol and 2,6-dichlorophenol.

Buffer solutions of potassium dihydrogen phosphate and sodium succinate at 25 ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€šÃ‚Â°C