| 金属离子选择电极法测定弱酸的离解常数 |
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| 引用本文： | 周激,吴耀焕,曹海燕.金属离子选择电极法测定弱酸的离解常数[J].分析试验室,1999,18(4):80-82. |
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| 作者姓名： | 周激 吴耀焕 曹海燕 |
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| 作者单位： | 华北工学院分院,太原,030008 |
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| 摘 要： | 通过对弱酸难溶盐平衡体系的讨论，导出了弱酸离解常数，金属离子浓度和溶液ｐＨ值之间的关系，从而给出一种利用金属离子选择电极测定弱酸离解常数的方法。采用该法，本文用钙离子选择电极对Ｈ２ＣＯ３，Ｈ２Ｃ２Ｏ４和ＨＦ的离解常数进行了测定，得到与文献值相一致的结果。同时本法可还以用来测定相应的溶度积常数。
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| 关 键 词： | 离子选择电极 弱酸 离解常数 |
| 文章编号： | 1000-0720(1999)
04-080-03 |
Determination for Dissociation Constant of Weak Acids by Metal Ion Selective Electrode |
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| ZHOU Ji,WU Yao-huan,CAO Hai-yan.Determination for Dissociation Constant of Weak Acids by Metal Ion Selective Electrode[J].Chinese Journal of Analysis Laboratory,1999,18(4):80-82. |
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| Authors: | ZHOU Ji WU Yao-huan CAO Hai-yan |
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| Abstract: | correlation formula between the ionization constant of a weak acid,the
concentration of metal ion and the pH value of solution was deduced by studying the
equilibrium system of on in soluble salt of the weak acid ,and a method of determination of the
ionination constant of the weak acid was developed by using metal ion selective electrode.By
this method the ionization conatants of H2CO3,H2C2O4 and HF were determined with a calcium
ion selective electrode,the values obtained accord with those in the references
(H2CO3:pK1=653,pK2=1025;H2C2O4:pK1=132,pK2=424;HF:pK=308).This method can also be
used to determine the corresponding solubility constants. |
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| Keywords: | Ionselective electrode weak acid solubility constant dissociation |
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