The ultrasonic velocity, density has been measured for the mixture of 2,4-hydroxy acetophenone-2,4,-dichlorobenzoyl hydrazone (H2L1), and 2,4-dihydroxy-5-nitroacetphenone-2,4,-dichlorobenzoyl hydrazone (H2L2) at different concentrations in dioxane at 303 K temperature. From the experimental data different acoustical properties like apparent molar volume, apparent molar compressibility, adiabatic compressibility, intermolecular free length (Lf), relative association (RA), acoustic impedance z, etc. have been calculated. These parameters obtained have been interpreted in terms of solute-solvent and solute-solute interactions. Molar refraction and polarizability constant for (H2L1) and (H2L2) at different percentages of dioxane have been calculated.