氯化铝与乙酸钠溶液混合的离子行为——基于认知冲突的科学探究与证据推理  

Ion Behavior of Aluminum Chloride Mixed with Sodium Acetate Solution

作　　者：陆燕海 吴文中 LU Yan-Hai;WU Wen-Zhong(Deqing High School Affiliated to Zhejiang University of Technology,Huzhou 313200,China;Yuezhou Middle School,Shaoxing 312075,China)

机构地区：[1]浙江工业大学附属德清高级中学,浙江湖州313200 [2]越州中学,浙江绍兴312075

出　　处：《化学教育(中英文)》2025年第3期76-80,共5页Chinese Journal of Chemical Education

基　　金：中国教育学会2023年度教育科研化学实验教学专项课题“学科实践育人:高中化学实验教学应用创新研究”(课题编号:202300170806ZXB)。

摘　　要：一次讨论盐类双水解是否能进行彻底的课堂教学中,学生们通过计算得知氯化铝和乙酸钠作用的平衡常数很大,但随后实验发现2种盐溶液混合后无明显现象。查阅资料和设计实验研究表明,常温下氯化铝和乙酸钠溶液混合可能得到了弱电解质Al(CH_(3)COO)_(3)。当温度升高后,Al(CH_(3)COO)_(3)一级电离可能得到Al(CH_(3)COO)^(+)_(2),并与溶液中OH^(-)作用形成Al(OH)-(CH_(3)COO)_(2)等白色沉淀。以此实验为真实情境实施教学活动,可引导学生感悟“发现问题→提出假设→实验验证→得出结论”之科学思维方法,挖掘实验的教学功能,发展学生的证据推理、实验探究、创新意识等学科核心素养。In a discussion of whether salt double hydrolysis could be carried out in the end,students calculated that the equilibrium constant of AlCl_(3)and CH_(3)COONa was very large,but subsequent experiments found that there was no significant phenomenon after mixing the two salt solutions.Access to data and design experimental studies showed that mixing AlCl_(3)and CH_(3)COONa solution at room temperature might obtain a weak electrolyte Al(CH_(3)COO)_(3).When the temperature increased,Al(CH_(3)COO)_(3)might undergo first-order ionization to obtain Al(CH_(3)COO)^(2+),which reacted with OH~-in solution to form white precipitates such as Al(OH)(CH_(3)COO)_(2).Using this experiment as a real-life scenario to implement teaching activities,this paper guided students to understand the scientific method of“finding problems,proposing hypothesis,experimental verification and drawing conclusions”,explored the teaching function of the experiments,and developed students'core qualities of disciplines such as evidence reasoning,experimental inquiry and innovative consciousness.

关 键 词：氯化铝 乙酸钠 认知冲突 创新意识 实验教学 

分 类 号：G633.8[文化科学—教育学]