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本文用分光光度法测定了离子强度为0.2至4.2范围内的离子对 CuSO_4和配阴离子Fe(Tiron)~-在各种支持电解质中的稳定性.在各种支持电解质中,两个配合物体系的稳定性随离子强度变化的趋势基本一致,但稳定性的极小值位置则大不相同.稳定性数据表明,提出的单参数的 Debye-Hückel 方程对 CuSO_4体系在离子强度小于2.0时适用;对 Fe(Tiron)~-体系则完全不能应用.本文简单地讨论了造成上述情况的原因.测得 CuSO_4和 Fe(Tiron)~-在25℃时的热力学稳定常数 logK_0分别为2.17和19.50.
In this paper, the ionic stability of CuSO_4 and anion Tiron with various ionic strength in the range of 0.2 to 4.2 was measured in various supporting electrolytes. Among the various supporting electrolytes, two complex systems Stability of the CuSO_4 system is almost the same with the change of ionic strength, but the position of the minimum of stability is very different. The stability data show that the proposed one-parameter Debye-Hückel equation is suitable for the CuSO_4 system when the ionic strength is less than 2.0. The reason for the above situation is simply discussed in this paper.It is found that the thermodynamic stability constants logK_0 of CuSO_4 and Fe (Tiron) ~ - at 25 ℃ are 2.17 and 19.50, respectively.