The experimental results reported in this paper are the first in a wider research program aiming to test, in a laboratory, the behavior of selected hydrophobic compounds in an aqueous system. The generator column method was used to determine the solubility in water of biphenyl, 1,2-dichlorobenzene (1,2-DCBz), and hexachlorobenzene (HxCBz) at 25 degreesC. The solubilities of 1,2-DCBz and HxCBz were measured at temperatures ranging from 15 to 55 degreesC, and the enthalpies of solutions were derived from van't Hoff plots. The effects of three electrolytes on the solubility of HxCBz were determined at 25 degreesC, and their newly obtained Setschenow constants are reported.