摘要：1问题的提出通常认为,FeCl3溶液中通入SO2只发生氧化还原反应,反应的化学方程式为2Fe^3++SO2+2H2O=2Fe^2+SO4^2-十4H^+,反应后溶液呈浅绿色。笔者进行实验,发现事实并非如此。取5mL0.05mol/LFeCl3溶液于试管中,通入SO2气体后,观察到溶液很快由黄色变为红棕色;继续通入SO2气体,溶液颜色变化不大.为什么溶液会变为红棕色,所得到的红棕色物质又是什么呢?
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