Effect of temperature difference on thermodynamic properties of L-Isoleucine In aqueous solutions of Thiamine Hydrochloride.

Abstract

Abstract The temperature difference can lead to different changes in thermodynamic and physico-chemical properties of solutions. The irretrievable thermodynamics offers interface conditions that yield chemical energy change at phase interfaces. The study of change in thermodynamic properties such as apparent molar volume, V 2,ϕ, limiting apparent molar volume, V 2 , ϕ 0 volume transfer properties, Δ t r V 2 , ϕ 0 and Hepler’s constant have been done by changing the temperature of solutions of L-isoleucine in aqueous thiamine hydrochloride from 298.15K to 318.15K at constant pressure. For this study, the density (ρ) of the solutions have been measured experimentally at five different temperatures. The effect of temperature difference and hence the mass-transfer in solutions creates some changes in the electrostriction among the solute and solvents. Thus, significant changes like structure-making and structure-breaking as well as intermolecular interactions changes take place in the solutions. In this paper we found that the difference in temperature impacted a much on the volumetric properties and the apparent molar volume as well as limiting apparent molar volume rise with the increase of temperature. The negative values of Hepler’s constant refers the solute is a structure breaker and the positive values of apparent molar volume as well as limiting apparent molar volume indicate the presence of strong solute-solvent interactions in the solution. This is loosened at higher temperatures.