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一、问题的提出 当我们在以U型管作为电解池进行氯化铜溶液电解实验时,随着电解的进行,发现阴极附近亮绿色的氯化铜溶液逐渐变暗,且随着电解时间的增加,这段溶液可以变为近乎墨绿色,并与氯化铜溶液有明显的界面。与此同时还可观察到阴极碳棒上铜沉积速度很慢,量很少,电解时间的增加对铜的沉积并无多大影响。上述现象引起我们的思考,如何进行解释呢? 二、探讨和实验 我们从两个方面着手实验,试图进行解释。首先,是否可能是碳电极上的一些碳粒进入溶
First, the problem arises when we use the U-tube as electrolytic cell electrolytic copper chloride solution experiment, with the progress of electrolysis, found that the bright green copper chloride solution near the cathode gradually darkened, and with the electrolysis time Increasing, this solution can become nearly dark green and has a clear interface with the cupric chloride solution. At the same time, it can be observed that the deposition rate of copper on the cathode carbon rod is very slow, and the amount is small. The increase of the electrolysis time does not have much influence on the deposition of copper. The above phenomenon caused our thinking, how to explain it? Second, discussion and experiment We started the experiment from two aspects, trying to explain. First, is it possible that some carbon particles on the carbon electrode enter the solution?