Thermodynamic study of the (KCl + N,N-dimethylformamide + water) system based on potentiometric measurements at T=298.2K

In this work, the results relating to the mean activity coefficients measurements of KCl in the (N,Ndimethylformamide+ water) mixed solvent system using the potentiometric method have been reported. The electromotiveforce (emf) measurements were performed on the galvanic cell of type: Ag | AgCl | KCl (m), N,N-dimethylformamide(wt.%), H2O (1-wt) % | K-ISE, in various mixed solvent systems containing 10, 20 and 30% mass fraction of N,Ndimethylformamideover ionic strength ranging from 0.0496 to 2.3500 mol kg-1 at T=298.2 K. The modeling of this ternarysystem was made based on the Pitzer ion-interaction model. The values of the mean activity coefficients, the excess Gibbsfree energy for the series under investigated system were determined.

کلیدواژه ها:

Activity coefficient ، Ion selective electrode ، N ، N-dimethylformamide ، KCl ، Pitzer model