Abstract
AbstractThe change in volume on mixing two alkanes of different molecular weight has been studied in order to provide further experimental data for testing current theories of solutions. A description is given of a dilatometer which permits a determination of the volume of mixing as a function of composition over a wide range of concentrations in a single experiment.Binary mixtures of n‐alkanes (C5 + C16, C6 + C16, C7 + C16, C8 + C16, C10 + C16 and C6 + C12) and the system iso‐octane‐n‐hexadecane were investigated in the temperature range of 20‐50° C. In all cases a contraction is observed which increases with temperature and with the difference in chain length of the two components. It ranges from 0.03% for the system n‐decane/n‐hexadecane to about 0.5% for a mixture of n‐pentane and n‐hexadecane at room temperature.It appears that the excess volumes of binary mixtures of n‐alkanes can be predicted from the molal volumes of the pure n‐alkanes on the basis of Brønsted's principle of congruence.
Published Version
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