DENSITY AND EXCESS MOLAR VOLUME OF TRI-N-OCTYLAMINE PLUS PROPIONIC-ACID PLUS DILUENT AT 298.15 K

The densities and excess molar volumes (V-E) for tri-n-octylamine (TOA ) + propionic acid, TOA + diluent, and propionic acid + diluent binary systems were measured under the full range of composition at 298.15 K , respectively. The excess molar volumes of TOA + propionic acid + dil uent ternary systems were also measured at 298.15 K. Benzene, toluene, p-xylene, ethanol, hexane, and cyclohexane were used as the diluent. The \V-MAX(E)\ of TOA + propionic acid is found to be about 6 cm(3) mo l(-1) at x(A) = 0.75. The maximum values of excess molar volume (V-MAX (E)) for the ternary systems showed smaller values than that of TOA propionic acid.