The ultrasonic velocity and viscosity of carbonato pentamine Co (III) nitrate in water and different proportions of glycerol-water mixtures were determined at 303.15 K. The Jones-Dole viscosity B-coefficient of the coordination complex is found to be largest in 40% (v/v) glycerol-water mixture. Various acoustic parameters viz. isentropic compressibility, intermolecular freelength, acoustic impedance, etc. have been calculated using experimentally determined values of ultrasonic velocity and density. The variation of these acoustic parameters are discussed in the light of solute-solvent and solute-solute interactions.