In this paper, the solubility of selected arylamine molecules in methanol, hexane, and benzene has been investigated. Solubility of mmmTTA in hexane and benzene is the highest while mTTA has the lowest solubility in benzene and hexane. The UNIFAC and the UNIQUAC binary adjustable parameters have been determined. On the basis of these parameters, the solubility of these molecules has been predicted and compared with the experimental data. The effect of meta or para substitutions in arylamine molecules on their solubility in organic solvents was experimentally determined and theoretically established. The adjustable parameters of the UNIFAC equation obtained in this study will help estimate the solubility of macromolecules with the same constitutional groups or estimate the solubility of mixture of arylamine molecules. Thermal properties such as specific heat, melting point, boiling point, and heat of vaporization of the selected arylamine molecules have been determined.