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Fe(OH)_2的制备是高中化学实验教学的难点之一。若课堂上按照教材选用的实验仪器和实验方法进行操作,一般情况下先观察到灰绿色沉淀的产生,放置一段时间后沉淀慢慢转化成红棕色,始终无法观察到白色絮状沉淀的产生。书本
The preparation of Fe (OH) _2 is one of the difficulties in high school chemistry experiment teaching. If the classroom in accordance with the teaching materials used in the experimental equipment and experimental methods to operate, under normal circumstances first observed the generation of gray-green precipitate placed for a period of time after the precipitate slowly transformed into red-brown, and always can not be observed white flocculent precipitation. book