Dissociation constants in dimethyl sulfoxide (DMSO) of various uncharged acids, monovalent cation acids, and some sulfonephthaleins have been determined. For uncharged acids, the anions of which have a localized charge, the difference between pKdSA in acetonitrile (AN) and DMSO is 9.7 to 10. For acids, the undissociated forms of which have intramolecular hydrogen bonding in AN, the difference is of the order of 11.5. This larger difference is attributed to breaking of these bonds by the strongly protophylic aprotic solvent DMSO. For ammonium and aliphatic amine cations, 3* + in AN and DMSO varies between 6 and 10, whereas ^ + in

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The dissociation constant of 2,6-dinitro-4-chlorophenol in , -dimethylformamide (DMF) has been determined conductometrically and spectrophotometrically, while that of 2,6-dinitrophenol was found spectrophotometrically. Dissociation constants of the corresponding tetraethylammonium salts were found of the order of 0.05. The glass electrode was calibrated in mixtures