Molar Excess Volumes and Excess Isentropic Compressibilities of Ternary Mixtures of o-Toluidine

摘要

Molar excess volumes, V_(ijk)~E, and speeds of sound, U_(ijk), of o-toluidine (i)+toluene (j)+o- or p-xylene (k) ternary mixtures and speeds of sound, U_(ij), of o-toluidine (i) + toluene or o- orp-xylene (j) binary mixtures have been determined as a function of composition at 308.15 K. Speeds of sound data have been utilized to evaluate excess isentropic compressibilities for binary (i+j) and ternary (i+j+ k) mixtures. Molar excess volumes, V_(ijk)~E, and excess isentropic compressiblities, (κ_S~E)_(ijk) data have been fitted to the Redlich-Kister equation to calculate ternary adjustable parameters and standard deviations. Flory theory for binary mixtures has been extended to predict V_(ijk)~E and (κ_S~E)_(ijk) for the studied ternary mixtures. It has been observed that theory correctly predicts the sign of Vfik values for o-toluidine (i)+toluene (j)+o-xylene (k) and (κ_S~E)_(ijk) values for o-toluidine (i)+toluene (j)+p-xylene (k) ternary mixtures.