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按照现行课本的规定做某些实验,现象不甚鲜明,现将一些实验的改进方法及注意事项介绍如下,供大家参考。 1.焰色反应:按课本的方法去做焰色反应实验,金属离子的焰色不易看清。如果改用氢焰,能够达到很好的效果。方法是:用启普发生器制取氢气,在氢气的导管口套上一个长约3～4cm的铝质成铁皮圆管(如在玻璃管口直接点燃氢气,
In accordance with the provisions of the current textbooks to do some experiments, the phenomenon is not clear, now some of the experimental improvement methods and precautions are described below for your reference. 1. Flame reaction: According to the textbook method to do the flame reaction experiment, the flame color of metal ions is not easy to see. If you use hydrogen flame, you can achieve good results. The method is: using a Kepler generator to obtain hydrogen gas, put a 3 to 4 cm long aluminum round iron pipe on the end of the hydrogen gas conduit (such as directly igniting hydrogen gas in the glass pipe mouth,