Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (01): 57-63.doi: 10.3866/PKU.WHXB19910109

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Thermodynamics of Electrolyte Mixtures Activity Coefficients in Aqueous Na2SO4-CuSO4 at 25 ℃

Yao Yan; Atkinson, G.   

  1. Qinghai Institute of Salt Lakes, Academia Sinica, Xining, Qinghai; Department of Chemistry, University of Oklahoma, Norman, OK73019 USA
  • Received:1989-08-31 Revised:1990-05-03 Published:1991-02-15
  • Contact: Yao Yan

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Abstract: In previous reports the ternary system Na_2SO_4-CuSO_4-H_2O was investigated by osmotic coefficient and solubility work. This paper reports the determenations of the mean activity coefficients of Na_2SO_4 in the ternary system at 25 ℃ and ionic strength 1.0 and 2.0 by emf method using a Na sensitive glass electrode vs. Hg-Hg_2SO_4 electrodes.
The Hg-Hg_2SO_4 electrodes were prepared in our laboratory and performance tests for the electrode pair were carried out. Linear near-Nernst response and good reproducibility and stability were observed.
Pitzer's recent equations were used to derived...

Key words: Ternary system Na2SO4-CuSO4-H2O, Ionic strength, Activity coefficients, Na Sensityve electrode, emf method