Enthalpies of mixing and complex formation of carbon tetrachloride with some methyl-substituted benzenes. Part II

Abstract

Measurements are reported of the enthalpy of mixing of carbon tetrachloride with o-xylene, m-xylene, p-xylene, mesitylene, and pseudocumene over the temperature range 0–55 °C. A modified design of calorimeter vessel is described. The results obtained are discussed by use of the theoretical treatment developed in Part I¹ which assumes the formation of complexes in solution between carbon tetrachloride and the methylbenzenes. The results could be fitted reasonably well to the theory with the exception of the CCl₄+o-xylene system. The enthalpy of mixing of the system CCl₄+m-xylene was found to show a double maximum at ca. 15–20 °C where the enthalpy of mixing curve changes sign.