摘要
从加热方法与钾块大小2个角度对钾燃烧条件与产物组成进行实验探究,认为开放体系中进行钾燃烧实验成功的关键是固体能迅速升温至钾的着火点,减少钾表面氧化膜的厚度,保留较多的金属钾.因此至少预热瓷坩埚2 min,再加入豌豆或更大的金属钾块才可观察到钾燃烧的现象.燃烧的黑色物质冷却后变为橙红色,以超氧化钾为主,燃烧产生的白烟中含有少量的碳酸钾.
This paper studied the combustion conditions of potassium and product composition from heating methods and size of potassium block, it was found that the key factor of combustion experiment in open system was that the potassium could rapidly heat to ignition point, reducing the thickness of oxide film on the surface of potassium, and keeping more metal potassium. Therefore,preheated porcelain crucible at least 2 minutes, and then added metal potassium larger than the size of a pea, the phenomena of potassium burning could be observed. The combustion product was from black to orange after cooling, the main component was potassium hyperoxide, and there was a small amount of potassium carbonate in the burning white smoke.
出处
《化学教育》
北大核心
2017年第17期64-66,共3页
Chinese Journal of Chemical Education
基金
北京市教育科学“十三五”规划2017年度一般课题,课题编号:CDDB17196
关键词
钾燃烧
加热方法
钾块大小
实验探究
combustion of potassium
heating methods
size of potassium block
experiment inquiry
