基于模型建构解决酸碱滴定曲线解题思维障碍

Addressing Thinking Obstacles in Solving Acid-Base Titration Curve Problems Based on Model Construction

学生在解决酸碱滴定曲线情境问题时常常存在各种思维障碍,基于模型建构及其应用,有助于解决学生酸碱滴定曲线解题思维障碍。剖析例题内在结构要素,聚焦电解质溶液滴定曲线命题关注的5个点,即起始点、等料点、等量点、中性点、恰好点。从"五点"出发,进行解题思维模型的建构,指引学生解题思维的发散与收敛等。精选试题情境为载体,将建构的模型思维应用于酸碱滴定曲线相关问题的解决,助力于真实情境中思维的启发、精准切入与生成等。实践过程中提升学生的模型认知核心素养,提升学生的化学学科思维品质。

Students often encounter a variety of thinking obstacles when solving problems involving the context of acid-base titration curves.Model construction approach and its application can help address these thinking obstacles.Such an approach involves an analysis of the underlying structural elements of example problems centering on the five points focused by problem design relating to titration curves of electrolyte solutions,that is,the starting point,equal material point,equivalence point,neutrality point and appropriateness point.Starting from these"five points",a problem-solving thinking model is constructed to guide students’divergence and convergence of thinking.Carefully-selected problem-based contexts are utilized to apply constructed thinking models in solving problems relating to acid-base titration curves,thereby inspiring thinking in real-world contexts,facilitating accurate identification of entry point for problem solving and knowledge generation.The practical process is aimed to improve students’core competencies relating to model cognition and their quality of thinking for the subject of chemistry.