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一、氢氧化亚铁的制备制取氢氧化亚铁白色絮状沉淀的关键是尽量排除空气中氧气的干扰。用注射器做为反应容器可以得到较好的效果,生成的白色絮状沉淀可以保持5分钟左右不改变颜色,同时还可以观察Fe~(2+)转化为Fe~(3+)时颜色变化的过程实验步骤: 1、硫酸亚铁的制备: 取100毫升的注射器一只,抽出针拴,加入适量的不锈钢丝(或还原铁粉),推上针拴后抽取经煮沸的1:6硫酸溶液(体积比)50毫升,排尽空气,用胶管和弹簧夹封住细管口;(如图1)。注射器内铁和硫酸
First, the preparation of ferrous hydroxide Preparation of ferrous hydroxide white flocculation is the key to exclude the interference of oxygen in the air. The use of a syringe as a reaction vessel can achieve better results. The resulting white flocculent precipitate can remain unchanged for about 5 minutes. At the same time, the color change of Fe~(2+) to Fe~(3+) can also be observed. Process Experimental Procedures: 1. Preparation of Ferrous Sulfate: Take one 100 ml syringe, remove the needle, add the appropriate amount of stainless steel wire (or reduced iron powder), push on the needle and extract the boiled 1:6 sulfuric acid solution. (Volume ratio) 50 ml, exhaust air, seal the fine nozzle with hose and spring clamp; (Figure 1). Syringe with iron and sulfuric acid