| 铋、铅离子共存时络合滴定铋的误差探讨 |
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| 引用本文： | 祁斌. 铋、铅离子共存时络合滴定铋的误差探讨[J]. 杭州师范学院学报(社会科学版), 1989, 0(6) |
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| 作者姓名： | 祁斌 |
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| 作者单位： | 杭州师范学院化学系 |
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| 摘 要： | 本文讨论了pH=1.0时,在pb~(2+)共存下,以二甲酚橙(XO)为指示剂,用EDTA络合滴定Bi~(3+)的误差问题。指出在此pH条件下,XO的主要存在形式为黄色的阴离子——H_5I_n~(2-),进而求得滴定终点时的lgk′Bi-XO值(=5.51),较好地解释了该滴定准确度较高的实验现象。
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| 关 键 词： | 络合滴定 副反应系数 条件稳定常数 二甲酚橙 滴定误差 |
THE DISCUSSION ON THE ERROR OF COMPLEXOMETRIC TITRATION OF BISMUTH WITH Pb~(2+) Bi~(3+) EXISTING IN THE SAME SOLUTION |
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| Qi Bin. THE DISCUSSION ON THE ERROR OF COMPLEXOMETRIC TITRATION OF BISMUTH WITH Pb~(2+) Bi~(3+) EXISTING IN THE SAME SOLUTION[J]. Journal of Hangzhou Teachers College(Humanities and Social Sciences), 1989, 0(6) |
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| Authors: | Qi Bin |
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| Affiliation: | Department of Chemistry |
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| Abstract: | The error is discussed in the complexometric titration of bismuth ion (Bi3+) in the presence of pb2+ and at pH = 1.0 by EDTA with xylenol orange (XO) as indicator. It points out that, the main present form of XO is yellow anion-H5In2- in this pH value. Thus the value of IgK/Bi-xo at the end point of this titration can be calculated to be 5.5lThe experimental phenomenon in this titration can be explained in rather good accuracy. |
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| Keywords: | complexometric titration side reaction coefficients conditional stability constant xylenol orange titration error. |
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