Ultrasonic absorption properties and Kirkwood–Buff integral functions for hydrogen peroxide–water and propanone–water mixtures at 298.2 K

Abstract

Kirkwood–Buff integral functions for water(1)–propanone(2) binary liquid mixtures have been calculated from their thermodynamic properties and used in highlighting the dependence of sound absorption properties on mole fraction, x₂, of the organic liquid component. At low x₂, the dependence of the integral function G₂₂ on x₂ points to hydrophobic association, but this trend is overwhelmed as x₂ increases by a dominant G₁₁ which points to a degree of microheterogeneity of the mixture at 298.2 K and ambient pressure. These trends are compared with the dependence on mole fraction of the integral functions for water(1)–hydrogen peroxide(2) mixtures. In the latter system, the key quantity is G₁₂, consistent with strong intercomponent interactions.