Sk. Mehta et Rk. Chauhan, ULTRASONIC VELOCITY AND APPARENT ISENTROPIC COMPRESSIBILITIES IN MIXTURES OF NONELECTROLYTES, Journal of solution chemistry, 26(3), 1997, pp. 295-308
Ultrasonic velocities have been determined for binary mixtures of pyri
dine + n-alkanol (C-1-C-10) over the whole composition range at 25 deg
rees C. The excess isentropic compressibilities K-S(E) and apparent mo
lar isentropic compressibilities K-phi S are estimated from these meas
urements. The K-S(E) values are negative for all the systems over the
complete mole fraction range except pyridine + decanol for which small
positive values are obtained. The standard partial molar isentropic c
ompressibilities (K) over bar(o) of the alkanols are positive and incr
ease linearly with the chain length of the alkanol molecules. It indic
ates that a methylene functional group makes a positive contribution t
o the expansion coefficient of a solute in these mixtures.