Solubility of octacosane and hexatriacontane in different n-alkane solvents

Abstract

The solubilities of octacosane in decane and dodecane and of hexatriacontane in hexane, octane, decane and dodecane in the temperature interval 11–38°C have been determined, and the standard enthalpies and entropies of solution, ΔH_d and ΔS_d, have been calculated from the solubility curves. For hexatriacontane ΔH_d increases by 5.5 kJ mol^–1 on passing from heptane via octane to decane as solvent. This shows the importance of local solution properties overlooked in current theories.