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Fe(OH)_2的制备是高一学习铁及其化合物时一个非常重要的演示实验,但在实验过程中灰绿色沉淀的快速形成一直是困扰实验室制取Fe(0H)_2的一个难点。为了解决这一教学难题,我们对该制取过程进行了如下理论研究和实验研究。一、对灰绿色物质组成及实验改进观点的再认识1.现阶段对灰绿色物质组成的一些看法观点1:认为灰绿色物质是Fe(OH)_2和Fe(0H)_3按一定比例组成的物质。
The preparation of Fe (OH) 2 is a very important demonstration experiment for high iron and its compounds. However, the rapid formation of gray-green precipitate during the experiment has been a difficult problem for the laboratory to make Fe (OH) 2. In order to solve this teaching problem, we make the following theoretical research and experimental research on this process. First, the composition of gray-green materials and experimental re-understanding of the point of view 1. At this stage on the gray-green material composition of some ideas Point 1: that the gray-green material is Fe (OH) _2 and Fe (0H) _3 by a certain percentage substance.