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高中教材必修1P60(实验3-9)制备氢氧化亚铁的实验,按课本上的操作是难以观察到白色沉淀的,只能看到先有灰绿色然后变成红褐色。查阅资料有一些改进措施:(1)加有机物隔绝空气;(2)煮沸赶走氧气;(3)滴管伸入液面以下,避免与氧气接触;(4)加入铁粉防氧化(但有黑色铁粉的干扰);(5)制备氢气制造还原性环境,防止Fe2+被氧化。结合以上五点改进,整合后仍未看到良好效果。我对该实验进行了方案改进。
High School Materials Required 1P60 (Experiment 3-9) Preparation of ferrous hydroxide experiment, according to the textbook operation is difficult to observe the white precipitate, you can only see the first gray-green and then into a red-brown. Access to information There are some improvements: (1) add organic matter isolated from the air; (2) boil away the oxygen; (3) dropper into the liquid level below to avoid contact with oxygen; (4) Black iron powder interference); (5) Preparation of hydrogen to create a reducing environment, to prevent oxidation of Fe2 +. Combined with the above five improvements, after the integration has not seen good results. I conducted a program improvement on this experiment.