论文部分内容阅读
人教版高中化学教材必修1在讲到Na2O2强氧化性时,有Na2O2与水反应的实验设计,但对于Na2O2与CO2的反应并没有实验加以验证。基于此,笔者设计了如下实验装置,可用于完成上述两个实验。一、实验装置实验装置如图1所示。二、实验操作步骤及现象1.将少量过氧化钠固体包在棉花中,用一根棉线将其系在铁架台上。2.在棉花的正下方放置一烧杯,向烧杯中加入少量开水,此时,水蒸气上升至棉花处,过一会儿,棉花燃烧,掉落至烧杯中,说明Na2O2与水反应放出O2同时反应放热。待反应结束后,向烧杯中滴入1滴~2滴酚酞溶液,溶液变红,证明Na OH的生成。
People’s Education Edition High School Chemistry Teaching Materials Compulsory 1 When it comes to strong oxidizing Na2O2, there is experimental design for the reaction of Na2O2 with water, but there is no experiment to verify the reaction between Na2O2 and CO2. Based on this, I designed the following experimental device can be used to complete the above two experiments. First, the experimental device Experimental device shown in Figure 1. Second, the experimental steps and phenomena 1. A small amount of solid sodium peroxide wrapped in cotton, with a cotton thread to tie it in the iron stage. 2. Put a beaker just below the cotton and add a small amount of boiling water to the beaker. At this moment, the water vapor will rise to the cotton place. After a while, the cotton will burn and drop into the beaker, indicating that Na2O2 will react with water to release O2 and react heat. After the reaction is over, 1 drop to 2 drops of phenolphthalein solution is dropped into the beaker, and the solution turns red, which proves the formation of Na OH.