Thermodynamics of ketone + amine mixtures. I. Volumetric and speed of sound data at (293.15, 298.15, and 303.15) K for 2-propanone + aniline, + N- methylaniline, or + pyridine systems

Densities, $\rho$, and speeds of sound, $u$, of 2-propanone + aniline, + N-methylaniline, or + pyridine systems have been measured at (293.15, 298.15 and 303.15) K and atmospheric pressure using a vibrating tube densimeter and sound analyser Anton Paar model DSA-5000. The $\rho$ and $u$ values were used to calculate excess molar volumes, $V^E$, and the excess functions at 298.15 K for the speed of sound, $u^E$, the thermal expansion coefficient, ${\alpha }_p^E$, and for the isentropic compressibility, ${\kappa }_S^E$ at 298.15 K. $V^E$ and ${\kappa }_S^E$ are both negative magnitudes and increase in the same sequence: aniline < N-methylaniline < pyridine. The $V^E$ and ${\kappa }_S^E$ curves are shifted towards higher mole fractions of 2-propanone. The data haven interpreted assuming strong acetone-amine interactions, and weak structural effects.