Various acoustic parameters such as isentropic compressibility (b_s), intermolecular free length (L_f), apparent molar volume (f), apparent molar compressibility (f_k), molar compressibility (w), molar sound velocity (R),acoustic impedance (z) of Na₂SO₄ in 10%, 20% and 30% methanol+water at303.15 K have been determined from ultrasonic velocity (V), density (r) and relative viscosity (h_r) of the solution. These parameters are related with the molar concentration of the solution and reflects distortion of the structure of the solvent (i.e., Propan-2-ol+water) when the solute is added to it.