Ultrasonic velocity (U), viscosity (h) and density (ρ) of lactose of (0.5m) in three aqueous electrolytic solutions of guanidine hydrochloride (GuHCl), barium chloride (BaCl2) and strontium chloride (Sr Cl2) have been measured at 298.15 K. The derived acoustical parameters namely adiabatic compressibility (b), apparent molal compressibility ( K j ), apparent molal volume ( V j ), limiting apparent molal compressibility ( 0 K j ), limiting apparent molal volume ( 0 V j ), and their constant (SK, SV), viscosity B–coefficient and hydration number (nH) have been computed from the experimental data. The variation of these parameters with respect the molality of solute has been discussed in terms of solute-solvent and solute-co-solute interactions
