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关于“油膜法估测分子直径”的实验,课本要求将油酸溶于酒精中,滴到水中的痱子粉里,待酒精蒸发和溶于水后,形成一层油膜,根据油酸的体积和油膜的面积算出油膜的高度,即油酸分子直径。在实验中,因涉及的材料多,易受各方面因素的影响,故失败率相当高。要做好这个实验,就要处理好以下几个
With regard to the “membrane method for estimating the diameter of molecules” experiment, textbooks require that oleic acid be dissolved in alcohol and dripped into the water in the medlar powder. After the alcohol evaporates and dissolves in water, an oil film is formed, according to the volume of oleic acid and The area of the oil film calculates the height of the oil film, which is the diameter of the oleic acid molecule. In the experiment, due to the large number of materials involved and the vulnerability to various factors, the failure rate was quite high. To do this experiment, we must deal with the following