| 氯化十六烷基吡啶对酸碱指示剂离解平衡及变色范围的影响 |
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| 引用本文： | 陈怀侠,徐海娥,李跃英. 氯化十六烷基吡啶对酸碱指示剂离解平衡及变色范围的影响[J]. 分析科学学报, 2006, 22(3): 306-308 |
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| 作者姓名： | 陈怀侠 徐海娥 李跃英 |
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| 作者单位： | 湖北大学,化学与材料科学学院,武汉,430062;湖北大学,化学与材料科学学院,武汉,430062;湖北大学,化学与材料科学学院,武汉,430062 |
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| 基金项目： | 湖北大学精品课程项目基金 |
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| 摘 要： | 探讨了表面活性剂氯化十六烷基吡啶形成的胶束对溴百里香酚蓝、甲酚红、邻甲苯酚酞和百里香酚蓝离解反应的离解常数的影响,同时,也研究了该表面活性剂对上述四种酸碱指示剂变色范围的影响。实验结果表明,表面活性剂存在时,酸碱指示剂的离解平衡及其变色范围将发生改变,选择适当的胶束溶液作为滴定介质,可以扩大酸碱指示剂的应用范围,同时也可以提高滴定的准确度。
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| 关 键 词： | 胶束 酸碱指示剂 离解常数 变色范围 |
| 文章编号： | 1006-6144(2006)03-0306-03 |
| 收稿时间： | 2005-03-15 |
| 修稿时间： | 2005-06-09 |
The Effect of Surfactant Micelles on the Dissociation Constants and the Colour-changing Points and Ranges of Acid-base Indicators |
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| CHEN Huai-xia,XU Hai-e,LI Yue-ying. The Effect of Surfactant Micelles on the Dissociation Constants and the Colour-changing Points and Ranges of Acid-base Indicators[J]. Journal of Analytical Science, 2006, 22(3): 306-308 |
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| Authors: | CHEN Huai-xia XU Hai-e LI Yue-ying |
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| Affiliation: | Faulty of Chemistry and Material Science, Hubei University , Wuhan 430062 |
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| Abstract: | The effect of hexadecy pyridine choride on the dissociation constants of thymol blue bromide,cresol red,o-ckesolphthalein and thymol blue,as well as their the colour-changing ranges were studied by spectrophotometry.The experimental results indicated that the colour-changing ranges got narrow,and the titration accuracy was increased when an appropriate surfactant micellar solution was chosen as a titration medium. |
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| Keywords: | Micelles Acid-base indicators Dissociation constants Colour-changing ranges |
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