华东化工学院无机化学教研室编写的《无机化学实验》(1982年第二版)一书的实验十三“氧化还原反应”,其中有一“氧化还原平衡移动”的实验内容。多次实践表明,若按书中所述的方法做该实验,不但要两次成胶,耗费较多时间,而且粗铜丝和硅胶间易出现缝隙,将使滴在无铅硅胶层上面的Na_2S溶液沿铜丝下渗,使铜丝及其周围的硅胶变黑,难于观看“铅树”的生长情况。为此,将实验方法改进如下: East China Institute of Chemical Technology Department of Inorganic Chemistry prepared by the “Inorganic Chemistry Experiment” (second edition, 1982) a book experiment thirteen “redox reaction”, of which there is a “shift redox” experimental content. Practice has shown that many times, if the method described in the book to do the experiment, not only twice gel, spend more time, and easy to appear between the thick copper wire and silica gel gap, will drop in the lead-free silicone layer above The infiltration of Na_2S solution along the copper wire darkens the copper wire and the surrounding silica gel, making it difficult to watch the growth of “lead tree”. To this end, the experimental method is improved as follows: