Untitled

Volumetric properties of (an organic compound + di-n-butyl ether) atT= 298.15 K

“…The different intercepts are related to the nature of the functional group. The above-described volumetric behaviour, quite similar to that already observed in water (8) and tetrachloromethane, (27) suggested the use of an addivity scheme for predicting partial molar volumes of organic compounds in DBE.…”

“…Following the procedure already adopted for aqueous solutions, (8) volume. The contribution of the methylene group was computed as the average increment inside the homologous series of alkanes, alcohols, and amines.…”

“…It will be shown later that this assumption fails for cyclic compounds. In the calculations, the V w increments recently proposed (8) were employed. Finally, the B i contributions of the functional groups were calculated, inside each homologous series of linear compounds, as mean values of the differences between the experimental V o 2 and the sum of the contributions of the hydrocarbon residue and the constant A.…”

“…The same conclusion can be reached by comparing the plot of V e in DBE (figure 3) with the analogous plot in aqueous solution. (8) …”

“…Furthermore, the partial molar volumes at infinite dilution in DBE V o 2 were obtained for compounds considered here together with compounds studied by other authors. These data are treated with an additivity scheme recently proposed for partial molar volumes in water, (8) which have allowed the calculation of group contributions to V o 2 . These are compared with the analogous data in water and discussed in terms of the relative ability of the two solvents in discriminating solutes of different nature or structure.…”