| 词条 | Disulfuric acid |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 410648395 | ImageFile1 = Dischwefelsäure - Disulfuric acid.svg | ImageFile1_Ref = {{Chemboximage|correct|??}} | ImageSize1 = 150 | ImageAltL1 = Structural formula of disulfuric acid | ImageFile2 = Pyrosulfuric acid molecule ball.png | ImageFile2_Ref = {{Chemboximage|correct|??}} | ImageSize2 = 150 | ImageAlt2 = Ball and stick model of the disulfuric acid molecule | IUPACName = Disulfuric acid [1] | OtherNames = Pyrosulfuric acid, Oleum |Section1={{Chembox Identifiers | CASNo = 7783-05-3 | CASNo_Ref = {{cascite|correct|??}} | UNII_Ref = {{fdacite|changed|FDA}} | UNII = NTC1O8E83E | PubChem = 62682 | ChemSpiderID = 56433 | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | EINECS = 231-976-8 | MeSHName = Pyrosulfuric+acid | ChEBI_Ref = {{ebicite|correct|EBI}} | ChEBI = 29211 | SMILES = OS(=O)(=O)OS(O)(=O)=O | SMILES1 = OS(=O)(=O)OS(=O)(=O)O | SMILES2 = O=S(=O)(O)OS(=O)(=O)O | StdInChI = 1S/H2O7S2/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6) | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | InChI = 1/H2O7S2/c1-8(2,3)7-9(4,5)6/h(H,1,2,3)(H,4,5,6) | StdInChIKey = VFNGKCDDZUSWLR-UHFFFAOYSA-N | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | InChIKey = VFNGKCDDZUSWLR-UHFFFAOYAZ }} |Section2={{Chembox Properties | H=2 | O=7 | S=2 | MeltingPtC = 36 | ConjugateBase = Disulfate }} }} Disulfuric acid (alternative spelling disulphuric acid) or pyrosulfuric acid (alternative spelling pyrosulphuric acid), also named oleum, is an oxyacid 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 → H2S2O7 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
References1. ^{{RedBookRef|page=130}}
4 : Hydrogen compounds|Pyrosulfates|Sulfur oxoacids|Acid anhydrides |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。