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2010年第4期
52
WWW.gdchem.com
第37卷总第204期
碘分配系数及平衡常数的计算
(湛江师范学院化学科学与技术学院,广东湛江524048)
£摘要}在碘和碘离子反应平衡常数的测定实验中,由于碘的水溶液较难配制且与碘四氯化碳溶液构成的复相系统不易建立平衡,文章因此
采用豫种不同浓度的Kl溶液与碘的四氯化碳溶液构成两个复相平衡系统,采甩氧化一还原滴定方法确定各组分平衡浓度,并在此实验基础上推 导出了碘的分配系数及反应平衡常数的计算公式。实验表明,采用上述方法建立的复相系统较易达到平衡,实验测定的分配系统和平衡常数更 为准确。
【关键词】碘和碘离子;分配系数;平衡常数;相平衡 【中图分类号】TQ 【文献标识码]A [文章编每]1007-1865(2010)04—0052-02
马琳,莫春生,徐旭耀,许丽梅,苗碗根
Calculation of the Distribution Coefficient of Iodin and the Reaction
Equilibrium Constant
Ma Lin,Mo Chunsheng,Xu Xuyao,Xu Limei,Miao Wangen
(Chemistry Science and Technology School,Zhanjiang Normal University,Zhanjinag 524048,China)
Abstract:In the experiment ofdetermination ofthe equilibrium constant ofthe reaction ofiodin and iodin ion.for the iodin—in water solution hardly orfmed and
the equilibrium of the diphase system consisting of the iodin-in—water solution and the iodin—in—CC14 solution hardly established,a new method was proposed in the
paper to build up two diphase equilibrium systems by using two KI solutions of diferent concentrations and wo itodin-in—CCI4 solutions.The oxidation-reduction titration method was adopted to determine the equilibrium c0ncencrations of all components.Based on the above experiment.the calcul