Abstract:

In one of the experiments of university chemistry laboratory, which is "determination of copper content in copper sulfate (iodometry)", the effect of adding KSCN and the time of adding it were explored at different concentrations of copper sulfate. Results showed that the content of copper was not affected when KSCN was added near the end point or after the introduction of starch, while the content of copper was significantly lower when KSCN was not added or added after KI. This research can be applied in the undergraduate laboratory teaching activity. Under these circumstances, students are divided into different groups according to experimental conditions. Students are guided to compare, analyze and discuss the experimental results. In such a way, students' exploration and innovation spirits are inspired and the teaching effect is improved compared with the traditional book-oriented teaching method.

Key words: Determination of copper content, Iodometry, KSCN, Cultivation of innovative ability