Volumetric properties of glucose in aqueous HCl solutions at temperatures from 278.15 to 318.15 K

Abstract

Densities have been measured for Glucose+HCl+Water at 10-degree intervals from 278.15 to 318.15 K. The apparent molar volumes (V_ε,G) and standard partial molar volumes (V_ε,G⁰ ) for Glucose in aqueous solution of 0.2, 0.4, 0.7, 1.1, 1.6, 2.1 mol° kg^-1 HCl have been calculated as well as volumetric interaction parameters (VEG) for Glucose-HCl in water and standard partial molar expansion coefficients (aV_ε,G0/aT)_p. Results show that (1) the apparent molar volume for Glucose in aqueous HCl solutions increases lineally with increasing molality of Glucose and HCl; (2) V_ε,G⁰ for Glucose in aqueous HCl solutions increases lineally with increasing molality of HCl; (3) the volumetric interaction parameters for Glucose-HCl pair in water are small positive and vary slightly with temperature; (4) the relation between V_ε,G⁰ and temperature exists as V_ε,G⁰ = ?0+?1(T-273.15 K)^2/3; (5) values of (aV_ε,G⁰/aT)_p are positive and increase as temperatures rise, and at given temperatures decrease slightly with increasing molalities of HCl, indicating that the hydration of glucose decreases with increasing temperature and molality of HCl. These phenomena are interpreted successfully by the structure interaction model.

Keywords

glucose, HCl, density, apparent molar volume, standard partial molar isobaric expansion coefficient, structure interaction