SO2与BaCl2溶液反应与pH值关系的实验探究  

Experimental Research on the Relationship between the Reaction of SO2 and BaCl2 Solution and pH

作　　者：冯定坤 张杰 FENG Ding-kun;ZHANG Jie(College of Chemistry and Chemical Engineering,Qiannan Normal University for Nationalities,Duyun,Guizhou 558000,China)

机构地区：[1]黔南民族师范学院化学化工学院,贵州都匀558000

出　　处：《教育教学论坛》2020年第20期391-392,共2页Education And Teaching Forum

基　　金：黔南民族师范学院硕士生导师培育课题“高中化学学习法的研究”。

摘　　要：针对高中化学中二氧化硫水溶液中滴加氯化钡溶液是否有沉淀的知识点,设计了pH值对反应的影响的实验。结果表明:实验表明当pH≥10时,会有BaSO3沉淀。当沉淀中加入盐酸到溶液pH为4时,沉淀开始溶解,完全溶解时pH为1。充分说明通过调节SO2与BaCl2溶液的pH值可以控制是否有BaSO3沉淀生成。这种设计对于培养学生的严谨科学思维有着重要的意义。Aiming at the knowledge point of whether there is precipitation in the solution of sulfur dioxide if barium chloride is added in high school chemistry,the experiment of the effect of pH value on the reaction is designed.The results show that BaSO3 precipitation occurs when pH≥10.When hydrochloric acid is added to the precipitation solution at pH of 4,the precipitation begins to dissolve,and when it is completely dissolved,the pH is 1.It fully indicates that the pH value of SO2 and BaCl2 solution can be adjusted to control the formation of BaSO3 precipitation.This design is of great significance to cultivating students'rigorous scientific thinking.

关 键 词：SO2气体 BaCl2溶液 沉淀 PH值 NAOH溶液 

分 类 号：G642.423[文化科学—高等教育学]