Sound speed is determined for the ternary system of toluene + 1-dodecanol + cyclohexane as a function of composition and temperature. The observed data have been utilized to evaluate derived parameters like molar volume, molar free volume, isentropic compressibility, intermolecular free length, acoustic impedance and internal pressure. Further, these derived parameters are utilized to compute excess parameters. Various theories given by different researchers are also applied to the experimental sound speed and their percentage deviations have been calculated. By fitting excess parameters into Redlich-Kister polynomial equation smoothening coefficients and their standard deviations have been evaluated.
