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Revista Cubana de Química
versión On-line ISSN 2224-5421
Resumen
DILO, Mavitidi; CASALS-HUNG, Magaly y J. B. DE ASSIS, Jussara. Effect of Temperature and Concentration on the Viscosity of the Dilute Solutions of Lithium Tetrafluoroborate in Acetone and Acetonitrile. Rev Cub Quim [online]. 2016, vol.28, n.3, pp. 760-770. ISSN 2224-5421.
Viscosities of different dilute solutions of lithium tetrafluoroborate (LiBF4) in acetone and acetonitrile from 1x10-2 to 8x10-2 mol.dm-3 were measure at the Kelvin temperatures 298,15, 303,15, 308,15, 313,15 and 318,15 using a viscometer Ubbelohde. The viscosity data were used to evaluate the ion-ion interactions and the ion-solvent interactions in terms of A and B coefficients of Jones-Dole equation, respectively. The positive values of B coefficient in both solvents indicate that LiBF4 behave as structure maker. With the viscosity data, enthalpy change of activation ΔH≠, entropy change of activation ΔS≠ and free energy change of activation ΔG≠, were evaluated as a function of salt concentration and temperature.
Palabras clave : viscosity; lithium tetrafluoroborate; aprotic solvent, ion - solvent interaction; thermodynamic parameters.