探究镁与氯化钠溶液反应的微观过程  

Explore Micro Process of Reaction Between Magnesium and Sodium Chloride Solution

作　　者：李雪峰 LI Xue-Feng(The No.7 Middle School of Hefei,Hefei 231600,China)

机构地区：[1]合肥七中,安徽合肥231600

出　　处：《化学教育（中英文）》2021年第11期86-89,共4页Chinese Journal of Chemical Education

基　　金：安徽省合肥市2019年度教育规划课题“基于核心素养的高中化学数字化实验案例研究”(HJG19117)。

摘　　要：镁在常温下和水发生反应的速率较慢,这是因为镁表面存在氢氧化镁附着层的保护作用,但是镁可以和NaCl溶液发生较快的反应,在产生大量气泡的同时生成白色固体。通过对白色固体进行分析发现,在有Cl-的环境下氢氧化镁会逐渐转化为碱式氯化镁,同时也会导致溶液pH的升高。经过实验探究发现,镁在不同浓度NaCl溶液中的反应现象存在差异,在反应过程中溶解氧含量也会下降。The reaction rate of magnesium with water is slow at room temperature,which is due to the protective effect of magnesium hydroxide adhesive layer on the surface of magnesium.However,magnesium can react with NaCl solution quickly and generate a large number of bubbles and white solid at the same time.Through the analysis of white solid,it is found that magnesium hydroxide will gradually convert into basic magnesium chloride in the environment of Cl-,which will also lead to the increase of pH of solution.It is found that the reaction phenomenon of magnesium in different concentrations of NaCl solution is different,and the content of dissolved oxygen will also decrease in the process of reaction.

关 键 词：镁 氯化钠 溶解氧 碱式氯化镁 实验探究 

分 类 号：G633.8[文化科学—教育学]