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由于无机化学教材对E—pH图的绘制及物质稳定区域等内容讲得不很透彻,同学们作起习题来感到不得要领,本文试图对一道习题作出粗浅解答,并对C1_2—H_2O体系的E—pH图及其应用作一些讨论,旨在加深同学对上述问题的理解。 Cl_2在水中存在的状态有HCIO、CIO~-、Cl_2、Cl~-等。假设P_(Cl_2) = 1 atm,HCIO、ClO~-、ClO~-,Cl~-各离子浓度都为1 mol. dm~-3在温度为298K时,各电极反应为:
As inorganic chemistry textbook is not very thorough on the drawing of E-pH chart and material stable area, the students feel unforgiving. This paper attempts to make a crude solution to a problem and the E -pH diagram and its application for some discussion, to enhance students’ understanding of the above issues. The existence of Cl_2 in the water state HCIO, CIO ~ -, Cl_2, Cl ~ - and so on. Assuming that P_ (Cl_2) = 1 atm, the concentrations of HCIO, ClO ~ -, ClO ~ - and Cl ~ - ions are all 1 mol. When the temperature is 298K, the reaction of each electrode is: