摘要
针对目前实验室用MnO_(2)与浓HCl反应制取氯气实验存在反应物用量没有说明,反应原理学生不易理解,现象不明显等缺陷,提出了实验室用K_(2)S_(2)O_(8)与HCl反应制备氯气,并利用正交试验法探讨了实验室用K_(2)S_(2)O_(8)与HCl反应制取氯气的最佳工艺条件。实验表明:用K_(2)S_(2)O_(8)与HCl反应制取氯气,避免了MnO_(2)与浓HCl共热制取氯气实验中的缺陷,且实验现象明显,反应速率适中,完全满足了课堂演示和学生实验的要求。因此,建议中学化学教学中选用该方法为制备氯气的课堂演示实验或学生实验。
In response to the shortcomings of the current laboratory experiment using MnO_(2) to react with concentrated HCl to produce chlorine gas,such as the lack of explanation of reactant dosage,difficulty for students to understand the reaction principle,and unclear phenomena,a laboratory experiment using K_(2)S_(2)O_(8) to react with HCl to produce chlorine gas was proposed.The orthogonal experimental method was used to explore the optimal process conditions for the reaction of K_(2)S_(2)O_(8) with HCl to produce chlorine gas in the laboratory.The experiment shows that using K_(2)S_(2)O_(8) and HCl to produce chlorine gas avoids the defects in the experiment of co heating MnO_(2) with concentrated HCl to produce chlorine gas.At the same time,the phenomenon is obvious during the experiment,and the reaction rate is moderate,fully meeting the requirements of classroom demonstrations and student experiments.Therefore,it is recommended to use this method in middle school chemistry teaching as a classroom demonstration experiment or a student experiment for preparing chlorine gas.
作者
吴佳鑫
丁浩栋
吴嘉欣
梁永锋
Wu Jiaxin;Din Haodong;Wu Jiaxin;Liang Yongfeng(College of Chemistry and Chemical Engineering,Ningxia Normal University,Guyuan 756000,China)
出处
《云南化工》
CAS
2024年第3期103-105,共3页
Yunnan Chemical Technology
基金
宁夏回族自治区无机化学“一流课程”建设项目资助(NXYLKC201906)
宁夏师范学院“一流基层教学组织”建设项目资助(NSYLJYS202006)。
关键词
氯气制备
过硫酸钾与盐酸
最佳条件
正交试验
chlorine gas preparation
potassium persulfate and hydrochloric acid
optimum conditions
orthogonal experiment
