大家熟知的硫酸铜水溶液是兰色的。这是因为硫酸铜溶于水后,铜离子和水分子结合形成兰色的水合铜离子,所有易溶于水的铜盐溶液里都有兰色的[Cu(H_2O)_4]~(2+)络离子存在,那么CuCl_2溶液是否一定都是兰色呢?下面我们来做一个有趣的实验:把一定量CuCl_2放入大试管里加入少量蒸馏水溶解制成近饱和溶液衬以白纸观察,看到CuCl_2在很浓溶液里显黄绿色。向大试管里滴加少量蒸馏水,再衬以白纸 The well-known aqueous copper sulfate solution is blue. This is because when copper sulfate is dissolved in water, copper ions and water molecules combine to form blue hydrated copper ions. All the water-soluble copper salt solutions have a blue [Cu(H_2O)_4]~(2+). ) The presence of complex ions, then whether the CuCl 2 solution is always blue? Let’s do an interesting experiment: Put a certain amount of CuCl 2 in a large test tube and add a small amount of distilled water to dissolve it. Make a near saturated solution lined with white paper. To CuCl 2 in a very concentrated solution was yellow-green. Add a small amount of distilled water to the large test tube, then line it with white paper