Determinación experimental de los coeficientes de actividad del cloruro de sodio en la mezcla 2-hidroxi-etilamino butirato + h20 a 298,15 k mediante método electroquímico.

Abstract

The main objective is to continue with a series of electrochemistry work of mixtures of Ionic liquids and water as a solvent1 with to provide accurate data for future particular applications. The mean activity coefficients for NaCl in (2-HEAB + H2O) as a solvent mixture were determined by cell potential measurements: Na−ion selective electrode (ISE)|NaCl (m), 2-HEAB (w), H2O (1-w)|Cl−ion selective electrode (ISE) at molality from (0.10 to 3.20) mol·kg−1 at 298.15 K. Different weight fractions (w) of 2-HEAB with w = (0.01, 0.05, 0.1, 0.2, 0.3 and 0.4) were used. At higher concentration of w= 0.40, NaCl is salting out by 2-HEAB in water. The Pitzer ion interaction parameters 0, 1 and Cwere used to find the values of osmotic coefficients, solvent activity and the excess Gibbs free energy for the mixed electrolyte system. The results may be interpreted by the formation of 2- HEAB + water clathrate-like.A qualitative description of the relation between water and the 2-HEAB was done using the general AMBER force field (GAFF). Key words Ionic Liquid, 2-hidroxy-ethylammonium butyrate, mean activity coefficients, electromotive force, Nernst/Nikoskyn equation, Pitzer model.