利用手持技术数字化实验促进学生对配合物概念的学习——以铜氨配合物的形成和破坏过程为例

Promote Students’ Learning of Complexes by Hand-Held Technology Digital Experiment: Formation and Destruction of Copper-Ammonia Complexes

从高中"配合物"概念教学中值得探讨的问题出发,以手持技术TQVC概念认知模型为理论依据,利用手持技术pH和电导率传感器对铜氨配合物的形成与破坏过程进行探究。首先以氨水滴定硫酸铜溶液,然后以硫酸反滴定铜氨配合物溶液。与此同时,利用手持技术获取反应过程中的pH和电导率变化曲线。再根据四重表征模型,从宏观、微观、符号、曲线4个角度对反应过程进行分析,从而揭示反应的本质,多维度实现"配合物"概念的有效建构。

Starting from the issues existing in the teaching of complexes concept, this study explored the formation and destruction of copper-ammonia complexes by using the pH sensor and conductivity sensor of hand-held technology based on the TQVC conceptual cognitive model. Firstly, the copper sulfate solution was titrated with ammonia water, and then the copper-ammonia complex solution was titrated with sulfuric acid. At the same time, the pH and conductivity change curves of the reaction process were obtained. According to the Tetra-Representation model, the reaction process was analyzed from four angles: macroscopic, microscopic, symbol and curves. It revealed the essence of reaction and realized the effective construction of complex concept in multidimensional degree.