查看“︁焦磷酸”︁的源代码

{{Chembox
|   ImageFile = Pyrophosphoric-acid-2D.png
|   ImageName = 焦磷酸的结构
|   ImageFile1 = Pyrophosphoric-acid-3D-vdW.png
|   ImageName1 = 焦磷酸的3D模型
|   IUPACName = Diphosphoric acid<br />μ-oxido-bis(dihydroxidooxidophosphorus)
| Section1 = {{Chembox Identifiers
| CASNo = 2466-09-3
| CASNo_Ref = {{cascite|correct|CAS}}
|    SMILES  =  OP(=O)(O)OP(=O)(O)O
|    ChemSpiderID  =  996
|  IUPHAR_ligand  =  3151
|  ChEBI_Ref  = {{ebicite|correct|EBI}}|  ChEBI  =  29888
|  PubChem  =  1023
|  UNII_Ref  = {{fdacite|correct|FDA}}|  UNII  =  4E862E7GRQ
|  InChI  =  1/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)
|  InChIKey  =  XPPKVPWEQAFLFU-UHFFFAOYAX
|  ChEMBL_Ref  = {{ebicite|correct|EBI}}|  ChEMBL  =  1160571
|  StdInChI_Ref  = {{stdinchicite|correct|chemspider}}|  StdInChI  =  1S/H4O7P2/c1-8(2,3)7-9(4,5)6/h(H2,1,2,3)(H2,4,5,6)
|  StdInChIKey_Ref  = {{stdinchicite|correct|chemspider}}|  StdInChIKey  =  XPPKVPWEQAFLFU-UHFFFAOYSA-N
|  ChemSpiderID_Ref  = {{chemspidercite|correct|chemspider}}
}}
| Section2 = {{Chembox Properties
|   Formula = H<sub>4</sub>P<sub>2</sub>O<sub>7</sub>
|   MolarMass = 177.98
|   Density =
|Appearance=白色到浅黄色固体<ref name=acros>{{Acros|38876|Datum=2010-02-26}}.</ref>
|   MeltingPt = 61&nbsp;°C<ref name=acros/>
|   BoilingPt =
| pKa1= 1.52<ref name="HoWi">{{Holleman-Wiberg|Auflage=101.|Startseite=?}}</ref> 
|pKa2=2.36<ref name="HoWi"/>
|pKa3=6.60<ref name="HoWi"/>
|pKa4=9.25<ref name="HoWi"/>
|   Solubility = 7090 g·l<sup>−1</sup><ref name=acros/>
|   SolubleOther = 易溶于[[醇]]、[[醚]]
  }}
}}

'''焦磷酸'''是一种[[磷的含氧酸]]，化学式 H<sub>4</sub>P<sub>2</sub>O<sub>7</sub>。它是一种中强酸，会[[放热]][[水解]]成[[磷酸]]。

== 制备 ==
焦磷酸可以通过磷酸在200–300&nbsp;°C下[[脱水]]而成。<ref>{{RömppOnline|ID=RD-04-01949|Name=Diphosphorsäure|Abruf=2014-06-16}}</ref>

:<math>\mathrm{2 \ H_3PO_4 \ \xrightarrow{\triangle} \ H_4P_2O_7 + H_2O}</math>

纯焦磷酸则可以通过磷酸和[[三氯氧化磷]]反应而成：<ref>[[Georg Brauer]] (Hrsg.): ''Handbook of Preparative Inorganic Chemistry.'' 2nd edition. Volume 1. Academic Press, New York u. a. 1963, S. 546–547.</ref>

:<math>\mathrm{5 \ H_3PO_4 + POCl_3 \longrightarrow 3 \ H_4P_2O_7 + 3 \ HCl}</math>

== 外部連結 ==
* [http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=217793 Pyrophosphoric acid at PubChem] {{Wayback|url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=217793 |date=20140517171841 }}

==参考资料==
{{reflist}}
{{无机酸}}
{{焦磷酸盐}}
[[Category:无机酸|磷]]
[[Category:焦磷酸盐|*]]
[[Category:缺少物质图片的化学品条目]]
[[Category:磷的含氧酸]]