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自由焓-氧化态图是以自由焓(G~0)为纵坐标、以氧化值(N)为横坐标所绘出的曲线图(简称G~0-N图)。例如,图1为锰的G~0-N图。这一图解用于说明元素的不同氧化态以及它们之间的氧化还原关系,在阐述单质、化合物在水溶液中进行氧化还原反应的过程中得到了广泛的应用。本文仅就应用此图判断歧化反应能否自发进行、计算歧化反应的平衡常数进行讨论,并纠正某些书刊中的一些错误。
The free enthalpy-oxidation diagram is a graph plotted with the free enthalpy (G 0) as the ordinate and the oxidation value (N) as the abscissa (G 0-N). For example, Figure 1 shows G 0-N maps of manganese. This diagram is used to illustrate the different oxidation states of the elements and the redox relationship between them. In describing the simple substance, the compounds have been widely used in the redox reaction in aqueous solution. This article only to determine whether the disproportionation reaction can be carried out spontaneously, to calculate the equilibrium constant disproportionation to be discussed and to correct some errors in some books and periodicals.