Excess volumes and isentropic compressibilities for (2-ethoxyethanol + n-heptane) at 298.15 K

Excess volumes and ultrasonic speeds have been measured for (2-ethoxyethanol + n-heptane) at 298.15 K. Isentropic compressibilities, excess isentropic compressibilities, and the partial molar excess quantities $\text{K}{}_{\mathrm{<mtext>S,\; </mtext><mtext>i</mtext>}}{}^{\mathrm{<mtext>E</mtext>}}\text{= ?(}\text{?V}{}_{\mathrm{i}}{}^{\mathrm{E}}\text{?p}\text{)}{}_{\mathrm{S}}$ were calculated from the results. The excess volume is positive over the entire mole-fraction range, whereas the curves for the excess isentropic compressibility is sigmoid with negative values occurring at mole fractions of 2-ethoxyethanol greater than 0.35. A qualitatitive interpretation of the results is presented.