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|Section2= }} Disulfuric acid (or pyrosulfuric acid) is an oxoacid of sulfur. It is a major constituent of fuming sulfuric acid, oleum, and this is how most chemists encounter it. It is also a minor constituent of liquid anhydrous sulfuric acid due to the equilibria: :H2SO4 ⇌ H2O + SO3 :SO3 + H2SO4 ⇌ H2S2O7 The acid is prepared by reacting excess SO3 with sulfuric acid: :H2SO4 + SO3 Disulfuric acid can be seen as the sulfuric acid analogue of an acid anhydride. The mutual electron-withdrawing effects of each sulfuric acid unit on its neighbour causes a marked increase in acidity. Disulfuric acid is strong enough to protonate "normal" sulfuric acid in the (anhydrous) sulfuric acid solvent system. There are salts of disulfuric acid, commonly called pyrosulfates, e.g. potassium pyrosulfate. There are other related acids with the general formula H2O·(SO3)x though none are isolable. ==See also== * Disulfurous acid * Oleum * Sulfuric acid * Sulfur oxoacid 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「disulfuric acid」の詳細全文を読む スポンサード リンク
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