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在讲解高中化学(人民教育出版社本)第二册第十一章(胶体溶液)内,用丁铎尔现象来区别胶体溶液与真溶液一段时,我是用了下面的方法,代替了原书中的暗箱实验法,我觉得这样作既经济又容易,所以提出来供同志们参考,并希予以指正。首先选用四个小烧杯,每个的外面用带有一小孔的黑纸围绕起来(小孔不要太大,约在三、四毫米的直径左右)再用浆糊把纸缝粘好。第一杯内注入蒸馏水并事先静置二三日;第二杯内,注入沉
In the explanation of the high school chemistry (People’s Education Press) Volume II, Chapter XI (colloidal solution), using the Dindor phenomenon to distinguish the colloidal solution and the true solution for some time, I used the following method instead of the original In the book’s black box experiment, I think this is both economical and easy. Therefore, I propose it for reference by my comrades and I hope it will be corrected. First, choose four small beakers, each surrounded by a black paper with a small hole (not too small hole, about three or four millimeters in diameter or so) and then use the paste to glue the paper. The first cup of distilled water and placed in advance for two or three days; the second cup, into the sink