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无机含氧酸有无氧化性,必须以下述两点作为判断依据:1.酸根是否稳定,成酸元素氧化数是否发生变化。2.E°值必须是正值,负值是没有意义的。有些文章作者,用H~+氧化性和酸的E°负值来对比说明磷酸有氧化性是不妥当的。因为,前者概念大笼统,后者在具体应用上无意义。以磷酸为例,不论在酸性或碱性介质中,它的E°值都是低正值或负值,很难举出它在实验室中作为氧化剂使用的例子,故通常都认为它是无氧化性的。在实际教学中准确表达概念,极为重要。无机含氧酸的氧化性,有它特定的含义、
The oxidizing nature of inorganic oxo acid must be based on the following two points: 1. Whether the acid radical is stable or not, and whether the oxidation number of acid-forming element changes. 2. The value of E° must be positive, negative value is meaningless. Some article authors, using the negative E 0 value of H 2+ oxidation and acid, show that oxidizing phosphoric acid is inappropriate. Because the former concept is largely general, the latter is meaningless in terms of specific applications. Taking phosphoric acid as an example, whether it is in an acidic or alkaline medium, its E° value is low positive or negative, and it is difficult to give examples of its use as an oxidant in the laboratory, so it is generally considered that it is not Oxidative. Accurately expressing concepts in practical teaching is extremely important. The oxidizing nature of inorganic oxo acids has its specific meaning,