高等学校化学学报

高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (10): 866.

• 研究简报 • 上一篇    下一篇

溶液中钪与草酸离子的配位作用

许绍权   

  1. 华南师范大学化学系
  • 收稿日期:1984-06-19 出版日期:1985-10-23 发布日期:1985-10-23

Coordination of Scandium with Oxalate Ions in Aqueous Medium

Xu Shaoquan   

  1. Department of Chemistry, South China Normal University, Guangzhou
  • Received:1984-06-19 Online:1985-10-23 Published:1985-10-23

PDF (PC)

被引次数

2

摘要： 提钪工艺中常使草酸钪溶于过量草酸铵溶液中。但文献中有关钪与草酸离子配位作用的报导甚少。等用分光光度法测定了ScC2O4+配离子的稳定常数,而J·Stary则用分配法测定了SC(C2O4)33-配离子的稳定常数,这些工作都没有对溶液中可能生成各级配离子进行研究。

Abstract: The solubilities of scandium-oxalate in solutions of various concentration of ammonium oxalate and ammonium perchlorate (the latter is to maintain a constant ionic strength of 2) were measured at 25℃. The existence of complexes ions [ScC2O4]+[Sc(C2O4)2]- and [Sc(C2O4)2]3- have been revealed from the treatment of experimented data by useing of qraphic extrapolation. The solubility product of scandium oxalate was also calculated to be 1.22×10-22 (μ = 2, pH=1). The succesive stability constants of the complexes formed were calculated by two ways: relaxation method and a least-squares technique on a computer. The results are as follows: β1 = 1.94 × 108; β2 = 5.5 × 1015; β5 = 2.0 × 1016.

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