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Abstract
The solubilities of a series of alkyl p-aminobenzoates were determined in water at three temperatures. The solutes chosen were the methyl through the n-butyl p-aminobenzoates and the temperatures studied were 25°, 33° and 40°. These compounds present a chemically related series differing by methylene additions in incremental steps. The solubility determinations at various temperatures enabled calculation of thermodynamic elements in aqueous systems.
A recurrent non-linear pattern was obtained in the calculated and experimentally derived thermodynamic values of enthalpy, entropy, and free energy. However, an approximately linear relationship of chemical structure and the partial excess free energy for these solutes was found for these aqueous solutions.