The Vapor Pressure of Two Immiscible Liquids System
LI Jun-Xin1**, CUI Min1, YAO Yan-Jun2
1.College of Sciences, Hebei University of Science and Technology, Shijiazhuang 050018, China;
2.Luannan Vocational Education Center, Luannan 063500, China
Abstract The vapor pressure of two immiscible liquids system was studied experimentally and theoretically. At equilibrium, the vapor pressure of the system approaches to, but is always less than, the sum of the saturated vapor pressures of the two pure components as their mutual solubilities decrease. When two immiscible liquids were placed together in static state, the upper layer could effectively but not completely prevent the volatilization of the lower layer. It was pointed out that this prevention effect was caused by the slow kinetic processes of dissolution, diffusion, and volatilization. A method was proposed to prevent the volatilization of the lower layer, that is, using an immiscible liquid with lower density to cover the lower layer, fulfill the container and sealed.
