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The solubility of naphthalene has been determined at 25" in the nine binory mixed solvents formed by combining toluene or ethylbenzene with each of the others in the series: ethylbenzene, toluene, carbon tetrachloride, cyclohexane, n-hexane and n-hexadecane. The determinations were made refractometrically under isothermal conditions. The average uncertainty in the solubilities is less than 0.001 in mole fraction naphthalene. Interaction in the ternan systems is related to that of the component pairs, using the approaches of Guggenheim and Hildebrand. The average errors in correlation by either approach am comparable, 0.002 to 0.003 in mole fraction naphthalene, for those systems of known solvent-solvent interaction effects.Solvent-solvent intemctions obtained by present ternary solubility studies are tompored to litemtun values based upon studies of the binary systems. The error introduced by approximating the interaction of a component pair in terms of the interaction of each member of the pair with a third component is considered, The approximation results in errors of the same magnitude as those which would be expected using the true pair interaction term.

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Refractive indices have been determined at 25°C. for the ternary systems of naphthalene and hexadecane with each of benzene, toluene, ethylbenzene, carbon tetrachloride, hexane and cyclohexane; and for several of the binary subsystems. Equations are given relating refractive index to solution composition in mole fraction. The average deviations in the ternary systems from predicted refractive indices by these equations range from 5 to 10 X 10-5 units among the systems. The deviations are nonrandomly distributed in each system.