EXCESS VOLUMES OF BINARY LIQUID MIXTURES OF N-ALKANES

The excess volume is presented for the binary n-alkane systems C10-C12, C12-C14, and C12-C16 at 45°, 55°, and 65° C. and the systems C10-C14 and C10-C16 at 55° and 65° C. A pycnometric technique was used to observe the densities of mixtures and pure components of each system, from which the excess volume was calculated. The excess volume was found to be negative in all cases and to become more negative with increasing temperature. The data reaffirm the principle of congruence and its application to the form of V (n) proposed by Hijmans and Holleman. Deviations from this correlation averaged 0.004 cc. per mole. The mixture volumes were also predicted using Flory's corresponding states theorem. Deviation from the prediction averaged 0.012 cc. per mole. The standard deviation in the experimental excess volumes was 0.007 cc. per mole. © 1969, American Chemical Society. All rights reserved.