高等学校化学学报

高等学校化学学报 ›› 1985, Vol. 6 ›› Issue (1): 7.

• 研究论文 • 上一篇    下一篇

Cr3+的水解聚合作用(Ⅴ)——Cr3+的第一和第二级水解常数

罗勤慧, 沈孟长, 丁益, 戴安邦   

  1. 南京大学配位化学研究所
  • 收稿日期:1983-07-19 出版日期:1985-01-24 发布日期:1985-01-24

Hydrolytic Polymerization of Chromium(Ⅲ) Ion(Ⅴ)——The First and Second Hydrolysis Constants of Cr3+

Luo Qinghui, Shen Mengchang, Ding Yi, Dai Anbang   

  1. Coordination Chemistry Research Institute, Nanjing University, Nanjing
  • Received:1983-07-19 Online:1985-01-24 Published:1985-01-24

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摘要： 本文首先用量热滴定法证实,在一定的pH范围内,一级水解产物CrOH2+可单独存在,而Cr(OH)+2则不能。进而在考虑单核和多核共存时,用曲线拟合法求出一级和二级水解常数lgβ11=-4.15±O.04,lgβ21=-8.40±0.03,并与前人的结果作了比较。

Abstract: The chromium(Ⅲ) ion is of characteristic by hydrolysis reaction. Its second hydrolysis-product Cr(OH)2+ always coexists together with polynucl-ear species, but this complicated case was not takeninto account while determinating hydrolysis constant of Cr(OH)2+. Therefore the result obtained by previous authors is unsatisfactory. We proved first by calorimetric titration that the first hydrolysis product CrOH2+ can exist alone, but Cr(OH)2+ can not within certain range of pHvalue and furthermore obtained the first and second hydrolysis constants by curve-fitting under considering the coexistence of mono- and polynuclear species. The result is as follows: lgβ11 = -4.15±0.04, lgβ21 = -8.40 ±0.03. The comparision with the previous results has deen made.

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