Effect of Temperature and Concentration on the Viscosity of the Dilute Solutions of Lithium Tetrafluoroborate in Acetone and Acetonitrile

Authors

  • Mavitidi Dilo Universidade Agostinho Neto, Luanda,Angola
  • Magaly Casals-Hung Magaly Casals-Hung Universidad de Oriente,Santiago de Cuba, Cuba
  • Jussara J. B. de Assis Universidade Agostinho Neto, Luanda,Angola

Abstract

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.

Keywords:viscosity, lithium tetrafluoroborate, aprotic solvent, ion – solvent interaction, thermodynamic parameters.

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Published

2016-09-16

How to Cite

Dilo, M., Magaly Casals-Hung, M. C.-H., & J. B. de Assis, J. (2016). Effect of Temperature and Concentration on the Viscosity of the Dilute Solutions of Lithium Tetrafluoroborate in Acetone and Acetonitrile. Revista Cubana De Química, 28(3), 760–770. Retrieved from https://cubanaquimica.uo.edu.cu/index.php/cq/article/view/1545

Issue

Vol. 28 No. 3 (2016)

Section

Artículos

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