关于碘和碘离子反应平衡常数的测定实验的一些探讨

Discussion and Improvement Experiment Approach in Iodine and Iodine Ion Reaction Equilibrium Constant

碘和碘离子反应平衡常数的测定是基础无机化学实验的重要内容,实验目的是加强学生对化学平衡、平衡常数的理解并了解平衡常数移动的原理,并练习滴定操作。在指导学生进行实验过程中,通过仔细观察和交流,发现了该实验常遇到的一些问题。对出现的问题进行了系统的分析,并提出了相应的改进方法,改进后的实验方案减少未溶解碘颗粒的吸入,改进后的实验提高了实验数据的正确率,加深了学生对无机化学实验的体会和认识。

The determination of iodine and iodine ion reaction equilibrium constant is one of the most important experiments in basic Inorganic Chemistry experiment. The experimental purpose is to strengthen student＇s understanding of chemical equilibrium and the equilibrium constant,understand the principle of equilibrium constant movement and titration operating practice. Some problems and defects of traditional procedure of this experiment were found and the reasons were discussed. The problems were analyzed,and the corresponding improvement method was put forward,which improved the accuracy of the experiment and deepened students understanding and cognition of Inorganic Chemistry experiment.