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The solubility of seven nonelectrolytes in nonpolar solvents and the activity of the solvent in saturated solutions have been investigated as functions of temperature. The activity of the solvent and the solubility of the solid have been correlated. A function invariant along the saturation line has been discovered. An exact differential equation for the temperature dependence of the activity of solvent along the liquidus of an eutectic system has been derived. The integration of this equation on the assumption that the enthalpy of solution is a linear function of temperature yields a two-parameter ( , ß) solubility equation.Experimental and calculated solubilities agree well for all 11 systems studied. The influence of and ß on solubility curves is discussed. Simple one-parameter solubility equations are proposed. A method of predicting solid-liquid phase diagrams from a single point coordinate is given.

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