一、硝酸钾加热分解实验实验的关键在于加热时的温度,通常使用的酒精灯温度是不够的,应采用酒精喷灯加热。 可取少量KNO_3晶体于硬质试管中(普通试管加热后易变形),待KNO_3晶体熔融沸腾3-5分钟,熔液呈浅黄色时,用带火星的木条伸到试管内即可检验到氧气,现象十分明显。 First, the key to the experiment of potassium nitrate heating decomposition is the temperature at the time of heating. The temperature of the commonly used alcohol lamp is not enough and should be heated with alcohol torch. It is advisable to take a small amount of KNO_3 crystal in a hard test tube (easy deformation after heating in common test tube). After the KNO_3 crystal is melted and boiled for 3-5 minutes, when the melt is light yellow, it can be detected by using a wooden strip with Mars extending into the test tube. The phenomenon is very obvious.