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按教科书的要求,用萘做熔解实验,由于加热过程的温度控制较困难,实验效果欠佳。六年前,我校开始用冰代替萘作熔解实验。去年,我们又汇集各方经验,改进了实验设备和操作方法。我们采用冰做熔解实验,装置比较简单,每个实验小组只需配备温度计一支、试管、小烧杯各一只。在实验的准备阶段,用大烧杯盛半杯碎冰,掺入细盐(冰、盐质量比为3∶1,可获得的零下二
According to the requirements of textbooks, with naphthalene melt test, due to the temperature control of the heating process is more difficult, the experimental results are not good. Six years ago, our school started to use ice instead of naphthalene for melting experiments. Last year, we brought together the experiences of all parties to improve the experimental equipment and methods of operation. We use ice melting experiment, the device is relatively simple, each experimental group only need to be equipped with a thermometer, test tube, a small beaker each one. In the preparation stage of the experiment, half a cup of ice was crushed with a large beaker, mixed with a fine salt (ice, salt mass ratio of 3: 1, available minus two