Volumetric and Acoustic Behavior of d(+)-glucose and d(−)-fructose in Aqueous Trisodium Citrate Solutions at Different Temperatures

Abstract

Apparent molar volumes (V ϕ ) and apparent molar isentropic compressions (K ϕ,S ) for saccharides d(+)-glucose and d(−)-fructose have been determined in water and (0.2, 0.4, and 0.6) mol·kg−1 aqueous solutions of trisodium citrate at T = (288.15, 298.15, 308.15 and 318.15) K and atmospheric pressure from density and speed of sound data. The partial molar volumes ( $$ V_{\phi }^{0} $$ ) and the standard partial molar volumes of transfer ( $$ \Delta V_{\phi }^{0} $$ ) from water to aqueous trisodium citrate solutions have been calculated. The partial molar expansion coefficients $$ (\partial V_{\phi }^{0} /\partial T)_{p} $$ and their second derivative $$ (\partial^{2} V_{\phi }^{0} /\partial T^{2} )_{p} $$ have also been estimated. The partial molar isentropic compression ( $$ K_{\phi ,S}^{0} $$ ) and partial molar isentropic compression of transfer ( $$ \Delta K_{\phi ,S}^{0} $$ ) have been calculated from the speed of sound data. Pair and triplet interaction parameters (V AB, V ABB) and (K AB and K ABB) from volumetric and speed of sound data, respectively, have been calculated using the McMillan–Mayer theory The results are discussed in terms of stereochemistry of the solutes and prevailing interaction in the mixtures.