Thermodynamics of Ketone + Amine Mixtures. Part III. Volumetric and Speed of Sound Data at (293.15, 298.15, and 303.15) K for 2-Butanone + Aniline, + N-Methylaniline, or + Pyridine Systems

Densities, ρ, and speeds of sound, u, of 2-butanone + 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 analyzer (Anton Paar model DSA-5000). The ρ 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, α P E, and the isentropic compressibility, κ S E . V E and κ S E are both negative magnitudes and increase in the sequence: aniline < N -methylaniline < pyridine. In contrast, u E is positive and changes in the opposite way. Data suggest the existence of strong interactions between unlike molecules.