利用手持技术数字化实验测定中和反应化学计量比

Determination of Stoichiometric Ratio of Neutralization Reaction Using Digital Experiment with Handheld Technology

化学计量比在中学教学及实际生产中有着重要应用,本研究针对化学计量比概念教学存在的不足,以手持技术TQVC概念认知模型为理论依据,设计实验测定中和反应的化学计量比。基于等摩尔连续变化法,本实验借助温度传感器测定不同物质的量之比反应物反应后的温度变化数据,找出最大温度变化差值对应的反应物物质的量之比,即化学计量比,帮助学生从定量的角度理解化学计量比概念。

Stoichiometric ratio has important applications in middle school teaching and actual production. Aiming at the shortcomings of the concept teaching of stoichiometric ratio, this research uses the handheld technology TQVC conceptual cognitive model as the theoretical basis to design experiments to determine the stoichiometric ratio of neutralization reaction. Based on the equimolar continuous change method, this experiment uses a temperature sensor to measure the temperature change data of reactants with different molar ratios to find out the reactant molar ratio corresponding to the maximum temperature change difference, that is, the stoichiometric ratio, to help students from a quantitative perspective understand the concept of stoichiometric ratio.