摘要
在三草酸合铁(Ⅲ)酸钾合成实验中,原实验操作步骤较笼统、操作条件控制不严格,导致多数学生只能得到较少的产物,有些甚至无法得到晶体,或得到白色晶体,实验的重现性也较差。本文对三草酸合铁(Ⅲ)酸钾合成的实验条件进行了深入探索,改善了实验结果的重现性,提高了产品的产率,获得了优化条件:(1)过氧化氢加40℃下慢速加入;(2)将溶液微沸2min左右去除剩余过氧化氢;(3)将溶液置于20℃的水浴中,交替加入9 mL饱和H2C2O4和3 mL饱和K2C2O4溶液后,加无水乙醇15 mL,即可得到高产率的翠绿色三草酸合铁(Ⅲ)酸钾晶体。
The traditional experiment in the preparation of potassium ferrioxalate has some defects, such as cursory processes arid undemanding operation conditions. It causes the following problems. Firstly, most students obtain limited yields. Secondly, some students only get white crystals or even nothing, thirdly, the reproducibility of the experiment is dissatisfying. The paper carries out the detailed analysis on the experimental conditions of synthesizing potassium ferrioxalate, and it improves the reproducibility of the experiment, and increases the yields and optimizes the results. Emerald grain crystals can be obtained at a high rate of yields by：（1） slowly adding H2O2 at 40 ℃（2 ;（2） gently boiling the solution for 2 minutes to eliminate the remaining H202; （3） Bathing the solution at 20 ℃, then adding 9 mL saturated H2C2O4 and 3 mL saturatedKEC2O4 in turn, and finally adding 15 mL anhydrous ethanol.
