Viscosities and densities of D-glucose-water mixtures were measured, and conductivities in the NiSO4-D-glucose-water system were also measured at 278.15-308.15 K in 5 K intervals. Based on the Lee-Wheaton conductivity equation, Values Of limiting molar conductivities Lambda(0) and association constants K-A were obtained. Changes in the standard thermodynamic functions, Gibbs energy Delta G(A)(T). enthalpy Delta H-A degrees(T). A and entropy Delta S-A degrees(T). for a process of ion-pair formation were calculated at different temperatures. The results show that (1) at given temperatures, the Lambda(0) values for 1/2NiSO(4) decrease with increasing concentrations Of D-glucose; (2) at fixed concentrations Of D-glucose, the Lambda(0) Values for 1/2NiSO(4) increase with increasing temperature; and (3) the process of association of NiSO4 is controlled by the change in entropy Delta S-A. (C) 2009 Elsevier B.V. All rights reserved.