基于“四重表征”的盐类水解平衡影响因素实验探究

Experimental Inquiry on Influencing Factors of Salt Hydrolysis Equilibrium Based on“Quadruple Representation”Teaching Mode

以“四重表征”教学模式为指导,设计了一系列手持技术数字化实验探究盐类水解平衡的影响因素。借助石蕊溶液的变色现象,直观呈现硫酸铵溶液在水解平衡移动过程中的宏观变化,利用pH传感器测定硫酸铵溶液水解平衡移动过程的pH曲线,两相结合,进而推测微观反应原理并以符号形式进行表征,从而提高学生的思维转化能力、宏微结合能力、科学探究能力和证据推理能力,落实化学学科核心素养,也能为相关的教学提供素材。

Based on"quadruple representation"teaching mode,a series of handheld technology digital experiments are designed to explore the influencing factors of salt hydrolysis equilibrium.Through the discoloration phenomenon of aqueous solution with litmus,the macroscopic changes of(NH,),SO4 solution hydrolysis equilibrium movement is visualized.Using pH sensor,the pH curve of(NH,),SO4 solution hydrolysis equilibrium movement is measured.By combining the macroscopic change with the pH curve,the microcosmic reaction principle will be deduced and then characterized by symbolic forms.Thus,these exploration experiments not only implement the cultivation of chemistry core literacy of developing students'thinking conversion ability,macro-micro combination ability,scientific inquiry ability and evidential reasoning ability,but also provide materials for relevant teaching.