Ostwald solubility coefficients, L, have been determined for 37 gases and vapours in methylene iodide at 298 K, and have been correlated through equation (i). where the solute explanatory log L = -0.74 + 0.32R2 + 1.34~: + 0.83@ + 1.1 9 B + 0.87 log L"variables are R, an excess molar refraction, . n: the solute dipolarity/polarisability, a: and fl the solute hydrogen-bond acidity and basicity, and log L16 where L" is the solute Ostwald solubility coefficient on hexadecane at 298 K. Similar equations have been constructed for solvation of solutes in tetrachloromethane, trichloromethane and 1.2-dichloroethane using literature data. It is shown that polarisability effects favour solvation in methylene iodide, through the R, term, but that such effects enhance the solubility of polarisable solutes only moderately: thus the R, term contributes 0.4 log units more in methylene iodide than in trichloromethane for the solute benzene.
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