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The potential molecular interactions among N-acetyl-l-cysteine (NAC), water (H2O), dimethyl sulfoxide (DMSO), and aqueous dimethyl sulfoxide (DMSO-H2O) were investigated from the experimental speed of sound (c) and density values (ρ) over the temperature range from 298.15 to 318.15 K and at atmospheric pressure. The acoustic parameters, viz., isentropic compressibility (κs), apparent molar isentropic compressibility (κs,ϕ), limiting apparent molar isentropic compressibility (κs,ϕ0), Sk, acoustic impedance (Z), hydration number (NH), and relative association (RA), were determined using experimental sound velocities. The results were interpreted in terms of possible solute–solute and solute–solvent interactions. Negative κs,ϕ values identifying molecules of water in the bulk solution seemed to be more compressible than those surrounding the ionic charges of the solute. κs, κs,ϕ0, and Z values indicate the presence of solute–solvent interaction, whereas Sk values specify that solute–solute interaction is also present in the studied system.
Khan et al. (Thu,) studied this question.