The Dissociation Constants of Some Disubstituted Anilines and Phenols in Aqueous Solution at 25 °C

The dissociation constants of six disubstituted anilines and of five disubstituted phenols in aqueous solution at 25 °C have been measured using the spectrophotometric method. Consideration is given to the extent to which these dissociation constants can be predicted from corresponding values for monosubstituted anilines and phenols. In addition, the question as to whether the pK value of a substituted aniline can be predicted from the pK value of a phenol with substituents in the same positions is also investigated.