Acta Phys. -Chim. Sin. ›› 1987, Vol. 3 ›› Issue (05): 501-507.doi: 10.3866/PKU.WHXB19870511

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THE STANDARD GIBBS ENERGIES OF TRANSFER AND THE ACTIVITY COEFFICIENTS OF NaF AND NaCl FROM WATER TO DIOXAN+WATER MIXTURES——USING IONSELECTIVE ELECTRODES TO STUDY THE THERMODYNAMICS OF SOLUTIONS

Chu Deying; Liu Li; Liu Ruilin   

  1. Department of Chemistry; Peking University
  • Received:1986-05-21 Revised:1986-11-27 Published:1987-10-15

Abstract: The reversible cell without liquid junction consists of the sodium ion glass- electrode and fluoride or chloride selective electrodes respectively, namely
Na~+ glass-electrode | MX(m) |
| w or s | X~- selective electrode
The standard electromotive forces of the cells have been measured in NaF- H_2O-Dioxan and NaCl-H_2O-Dioxan systems, then the standard Gibbs energies of transfer of NaF and NaCI from water to Dioxan-Water mixtures and the activity coefficients have been calculated.
The measured values of △E°_t for NaCl-H_2O-Dioxan systems have been compared with literature results. It indicated that the use of ion selective electrodes to study the thermodynamics of solution is reliable, also, the results of this paper have been compared with those of previous works. This influences of solvents on ΔG_t° have also been discussed.