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Permanganic acid is the inorganic compound with the formula HMnO4. This strong oxoacid has been isolated as its dihydrate. It is the conjugate acid of permanganate salts. It is the subject of few publications and its characterization as well as its uses are very limited. ==Preparation and structure== Permanganic acid is most often prepared by the reaction of dilute sulfuric acid with a solution of barium permanganate, the insoluble barium sulfate byproduct being removed by filtering: :Ba(MnO4)2 + H2SO4 → 2 HMnO4 + BaSO4 The sulfuric acid used must be dilute; reactions of permanganates with concentrated sulfuric acid yield the anhydride, manganese heptoxide. Permanganic acid has also been prepared through the reaction of hydrofluorosilicic acid with potassium permanganate, through electrolysis,〔 and through hydrolysis of manganese heptoxide, though the last route often results in explosions.〔 Crystalline permanganic acid has been prepared at low temperatures as the dihydrate, HMnO4·2H2O. Although its structure has not been verified spectroscopically or crystallographically, HMnO4 is assumed to be adopt a tetrahedral structure akin to that for perchloric acid. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Permanganic acid」の詳細全文を読む スポンサード リンク
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