Study of physicochemical and acoustical properties of benzaldehyde-methanol binary mixtures

The study focuses on the physicochemical and acoustical properties of binary mixtures to understand molecular interactions within the mixtures. We measured the viscosity and refractive index of benzaldehyde (BZ) and methanol (MeOH) mixtures over a temperature range of 293.15 K to 323.15 K at 10 K intervals, covering various concentrations. Density and ultrasonic velocity values of mixtures in a given concentration and temperature range were sourced from the literature. The experimental data were used to evaluate excess parameters, including excess refractive index ( \(\:{n}_{D}^{E}\) ​), excess molar volume ( \(\:{V}_{m}^{E}\) ), excess viscosity (η^E), and excess ultrasonic velocity (u^E). These excess parameters were fitted to the Redlich-Kister polynomial equation. The analysis of these parameters provided a deeper understanding of the molecular interactions within the mixtures, thereby enhancing our knowledge of their physicochemical properties.