查看“︁高氙酸”︁的源代码

{{NoteTA
|G1=Chemistry
|T=zh-cn:高氙酸;zh-tw:過氙酸;zh-hk:過氙酸;
|1=zh-cn:高氙酸;zh-tw:過氙酸;zh-hk:過氙酸;
}}
{{Chembox
|   Name = 高氙酸
|   ImageFile = Perxenonsäure Structural Formula V.1.svg
|   ImageSize = 150px
|   ImageName = Structural formula
|   IUPACName =
|   OtherNames = 
| Section1 = {{Chembox Identifiers
| CASNo = 14125-26-9
| CASNo_Ref = {{cascite|correct|NIH}}
|  SMILES  =  O=[Xe](O)(O)(O)(O)=O
|  RTECS  =  
|  ChemSpiderID_Ref  = {{chemspidercite|changed|chemspider}}|  ChemSpiderID  =  10466143
|  InChI  =  
|  InChIKey  =  
|  StdInChI_Ref  = {{stdinchicite|changed|chemspider}}|  StdInChI  =  
|  StdInChIKey_Ref  = {{stdinchicite|changed|chemspider}}|  StdInChIKey  =  
}}
| Section2 = {{Chembox Properties
|   Formula = H<sub>4</sub>XeO<sub>6</sub>
|   MolarMass =231.3212 
|   Appearance = 液体
|   Density = 
|   Solubility = 
|   MeltingPt = 
|   BoilingPt = 
|   pKa1 =< 0<ref name="Advances in Inorganic Chemistry" />
|pKa2=4.29 ± 0.03<ref name="Advances in Inorganic Chemistry" />
|pKa3=10.75 ± 0.04<ref name="Advances in Inorganic Chemistry">{{cite book|author=John H.Holloway, Eric G.Hope |title=Recent Advances in Noble-Gas Chemistry  |publisher=Academic Press |date=1998 |pages=51–100 |ISBN=0080578950 |DOI=10.1016/S0898-8838(08)60149-X}}</ref>
|pKa4=> 14<ref name="Protolytic properties of perxenic acid">{{cite book|author=Ulrik K. Klaening, E. H. Appelman |title=Protolytic properties of perxenic acid |date=1988-10 |pages=3760–3762 |DOI=10.1021/ic00294a018}}</ref>
|   pKb = 
|   Viscosity = 
  }}
| Section3 = {{Chembox Structure
|   MolShape = 
|   Coordination = 
|   CrystalStruct = 
|   Dipole =
  }}
| Section7 = {{Chembox Hazards
|   ExternalMSDS =
|   MainHazards = 
|   FlashPt = 
|   RPhrases = 
|   SPhrases = 
  }}
| Section8 = {{Chembox Related
|   OtherAnions =
|   OtherCations =[[碲酸]]<br />[[高碘酸]]
|   OtherCpds = [[四氧化氙]]、[[氙酸]]
  }}
}}
'''高氙酸'''（[[化学式]]：H<sub>4</sub>XeO<sub>6</sub>）是[[氙]]的一种[[含氧酸]]，只存在于水溶液中。它形成的盐是[[高氙酸盐]]。

== 制备 ==
高氙酸可以由[[四氧化氙]]和水反应而成：

<chem>XeO4 + 2 H2O -> H4XeO6</chem>

高氙酸根 XeO<sub>6</sub><sup>4−</sup> 可以通过[[氙酸]] H<sub>2</sub>XeO<sub>4</sub>的[[歧化反应]]而成：<ref>{{cite book|author=David W. Oxtoby, Wade A. Freeman, Toby F. Block|title=Chemistry 4th Edition|chapter=4|page=87AP|ISBN=0030331889}}</ref>

<chem>2HXeO4_{(aq)}- + 2OH_{(aq)}- -> XeO6_{(aq)}^{4}- + Xe + O2 + 2H2O_{(l)}</chem>

== 性质==
类似[[氙酸]]，高氙酸是一种强[[氧化剂]]。<ref>{{cite book|author=Catherine E. Housecroft, A. G. Sharpe|title=Inorganic Chemistry|publisher=Pearson Education|date=2005|page=499|ISBN=0130399132}}</ref>高氙酸的结构类似[[原碲酸]]和原[[高碘酸]]。<ref>{{cite book|author=Bruno Jaselskis, Stanislaus Vas|title=Xenic Acid Reactions with vic-Diols|publisher=J. Am. Chem. Soc|date=1964|pages=2078–2079|DOI=10.1021/ja01064a041}}</ref>

高氙酸无法被提纯，因为在酸性条件下高氙酸会迅速分解成[[三氧化氙]]、[[水]]和[[氧气]]。<ref name="Protolytic properties of perxenic acid" />

<chem>HXeO6^{3}- + 3H+ -> XeO3 + 2H2O + \frac{1}{2}O2 </chem>

由于这个分解反应，把 H<sub>3</sub>XeO<sub>6</sub><sup>−</sup> [[质子化]]成H<sub>4</sub>XeO<sub>6</sub> 是不可能的。<ref name="Protolytic properties of perxenic acid" />

==参考资料==
{{reflist}}

== 扩展阅读==
* {{cite book|author=Walter C. Hamilton, James A. Ibers, Donald R. Mackenzie |title=Geometry of the Perxenate Ion |publisher=Science |date=1963-08-09 |pages=532–534 |DOI=10.1126/science.141.3580.532}}

{{氙化合物}}

[[Category:高氙酸盐]]
[[Category:无机酸|氙]]
[[Category:含氧酸]]
[[en:Perxenate#Perxenic acid]]
{{無機化合物小作品}}