Summary
Excess molar volumesV E and excess molar heat capacitiesC EP at constant pressure have been determined, as a function of mole fractionx 1 at 298.15 K and atmospheric pressure, for the two liquid mixtures {pyridine or piperidine+cyclohexane}. The instruments used were a vibrating-tube densimeter and a Picker flow microcalorimeter, respectively. The two systems show positive excess volumes withV E(x 1=0.5)=0.531 cm3·mol−1 for {pyridine+cyclohexane} and 0.295 cm3·mol−1 for {piperidine+cyclohexane}. The curveC EP vs. x 1 for {pyridine+cyclohexane} shows a rather complex S-shape:C EP is negative at small mole fractionsx 1 of pyridine and positive forx 1>0.22, roughly.C EP of the piperidine system is negative throughout and strongly asymmetric with the minimumC EP (x 1,min)=−2.32J·K−1·mol−1 being situated at a mole fraction of piperidinex 1,min≈0.27.
Zusammenfassung
Für die beiden flüssigen Mischungen {Pyridin oder Piperidin+Cyclohexan} wurden molare ZusatzvoluminaV E und molare ZusatzwärmekapazitätenC EP bei konstantem Druck als Funktion des Molenbruchsx 1 bei 298.15K bestimmt. Die Messungen wurden mit einem Biegeschwinger-Dichtemeßgerät bzw. einem Strömungsmikrokalorimeter nach Picker durchgeführt. Die Zusatzmolvolumina beider Systeme sind positiv mitV E(x 1=0.5)=0.531 cm3·mol−1 für {Pyridin+Cyclohexan} und 0.295 cm3·mol−1 für {Piperidin+Cyclohexan}. Die KurveC EP vs. x 1 des Systems {Pyridin+Cyclohexan} zeigt einen ungewöhnlichen S-förmigen Verlauf: bei kleinen Molenbrüchenx 1 von Pyridin istC EP negativ, fürx 1>0.22 istC EP positiv. Die molare Zusatzwärmekapazität des Piperidinsystems ist überall negativ und stark unsymmetrisch: im Minimum beix 1,min≈0.27 findet manC EP (x 1,min)=−2.32J·K−1·mol−1.
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Lainez, A., Wilhelm, E. & Grolier, J.P.E. Thermodynamics of liquid mixtures containing hydrocarbons and strongly polar substances:V E andC EP of {pyridine or piperidine+cyclohexane} at 298.15 K. Monatsh Chem 125, 877–885 (1994). https://doi.org/10.1007/BF00812701
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DOI: https://doi.org/10.1007/BF00812701