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三元体系Na_2SO_4-CuSO_4-H_2O25℃活度系数的研究 被引量:6

THERMODYNAMICS OF ELECTROLYTE MIXTURES.ACTIVITY COEFFICIENTS IN AQUEOUS Na_2SO_4-CuSO_4 AT 25℃
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摘要 用自制的Hg-Hg_2SO_4电极和Na离子选择性电极,在25℃和离子强度分别为1.0和2.0的条件下,测定了Na_2SO_4在Na_2SO_4和CuSO_4混合水溶液中的平均活度系数。对所使用的电极组的热力学响应、重现性等性能进行了检验。根据文献提供的Pitzer方程,推导了计算Na_2SO_-CuSO_4-H_2O体系中Na_2SO_4和CuSO_4平均活度系数的表达式,求出了Pitzer混合参数和Harned方程系数,计算了CuSO_4在该体系中的平均活度系数。 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 derive expressions for the activity coeffici ents of Na_2SO_4 and CuSO_4 in the mixtures. The mixing interaction parameters θ_(NaCu) and ψ_(NaCuSO) in Pitzer's equations and Harned coefficients α and β in Harned equation were evaluated by least square fits of the emf data from the present work respectively. The mean activity coefficients of Na_2SO_4 calculated by these equations are in good agreement with the experimental data. The mean activity coefficients of CuSO_4 in the mixtures investigated were computed using Pitzer's equations with mixing parameter values from the present work and compared to that computed with the existing parameter values from osmotic coefficients.
作者 姚燕 Atkinson G
出处 《物理化学学报》 SCIE CAS CSCD 北大核心 1991年第1期57-63,共7页 Acta Physico-Chimica Sinica
关键词 水溶液 NA2SO4 CUSO4 活度系数 Ternary system Na_2SO_4-CuSO_4-H_2O, Ionic strength, Activity coefficients,Na Sensitive electrode, emf method
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