查看“︁钨酸钾”︁的源代码

{{Chembox
| ImageFile=Kaliumwolframat.png
|Section3={{Chembox Structure
| SpaceGroup=C2/m（No. 12）
| CrystalStruct= 单斜晶系
| LattConst_a= 12.39&nbsp;Å
|LattConst_b= 6.105&nbsp;Å
|LattConst_c=7.560&nbsp;Å
|LattConst_beta=115.96
|Reference=<ref name="ActaCryst" />
}}
|Section1={{Chembox Identifiers
| CASNo=7790-60-5
| EC-number= 232-215-2
|SMILES=[K+].[K+].[O-][W](=O)(=O)[O-]
| PubChem          = 3084032
}}
||Section2={{Chembox Properties
|K=2|W=1|O=4
| Appearance=无色无臭固体<ref name="Alfa" />
| Density= 3.12 g·cm<sup>−3</sup>（25 °C）<ref name="Sigma">{{Sigma-Aldrich|Aldrich|id=372617|Name=Potassium tungstate, 94%|Abruf=2016-06-06}}</ref>
| Schmelzpunkt     = 921 [[Grad Celsius|°C]]<ref name="Sigma" />
| Solubility=可溶于水<ref name="Dale L. Perry">{{cite book | last=Perry | first=Dale L. | title=Handbook of Inorganic Compounds | publisher=CRC Press | date=2016-04-19 | isbn=978-1-4398-1462-8}}</ref>
|SolubleOther=不溶于乙醇<ref name="Dale L. Perry" />
}}
|Section7={{Chembox Hazards
| Reference = <ref name="Alfa">{{Alfa|14031|Name=Potassium tungsten oxide, 99.5% (metals basis)|Abruf=2016-06-06}}</ref>
| GHSPictograms = {{GHS07}}
| HPhrases= {{H-phrases|319|335}}
| PPhrases= {{P-phrases|261|280|305+351+338|304+340|405|501}}
}}
|Section8={{Chembox Related
|OtherAnions=[[硫酸钾]]<br />[[铬酸钾]]<br />[[钼酸钾]]
|OtherCations=[[钨酸锂]]<br />[[钨酸钠]]<br />{{link-ru|钨酸铷|Вольфрамат рубидия}}<br />[[钨酸铯]]
|OtherCpds=[[重钨酸钾]]
}}
}}

'''钨酸钾'''是[[钾]]的一种[[钨酸盐]]，化学式K<sub>2</sub>WO<sub>4</sub>。钾的其它钨酸盐包括K<sub>0.33</sub>WO<sub>3.165</sub>和[[重钨酸钾]]K<sub>2</sub>W<sub>2</sub>O<sub>7</sub>。<ref>{{cite journal | last=Wagata | first=Hajime | last2=Fujisawa | first2=Maki | last3=Mizuno | first3=Yusuke | last4=Zettsu | first4=Nobuyuki | last5=Oishi | first5=Shuji | last6=Teshima | first6=Katsuya | title=Fabrication of Combined One-Dimensional and Three-Dimensional Structure of Potassium Tungstate Crystal Layers by Spray Deposition with Polystyrene Colloidal Crystal Templates | journal=Crystal Growth & Design | volume=13 | issue=8 | date=2013-08-07 | issn=1528-7483 | doi=10.1021/cg400714e | pages=3294–3298}}</ref><ref>{{cite journal | last=Range | first=Klaus-Jürgen | last2=Hegenbart | first2=Wilhelm | last3=Heyns | first3=Anton M. | last4=Rau | first4=Franz | last5=Klement | first5=Ulrich | title=Hochdrucksynthese und Kristallstruktur von Kalium- und Rubidiumdiwolframat(VI), K<sub>2</sub>W<sub>2</sub>O<sub>7</sub> und Rb<sub>2</sub>W<sub>2</sub>O<sub>7</sub> / High-Pressure Synthesis and Crystal Structure of Potassium and Rubidium Ditungstate(VI), K<sub>2</sub>W<sub>2</sub>O<sub>7</sub> und Rb<sub>2</sub>W<sub>2</sub>O<sub>7</sub> | journal=Zeitschrift für Naturforschung B | volume=45 | issue=2 | date=1990-02-01 | issn=1865-7117 | doi=10.1515/znb-1990-0202 | pages=107–110}}</ref>

== 制备 ==
钨酸钾可由[[钨酸钙]]与[[氟化钾]]反应得到：<ref>{{cite book|title=Advanced Inorganic Chemistry Vol-1 |publisher=Krishna Prakashan Media |date=2008 |isbn=978-81-87224-03-7 |url=https://books.google.de/books?id=0uwDTrxyaB8C&pg=PA1215#v=onepage&q&f=false|page=1215}}</ref>
:<chem>CaWO4 + 2KF -> K2WO4 + CaF2</chem>

它也可由[[钨酸]]与[[焦硫酸钾]]的反应产生：<ref>{{cite book|title=Vorproben und Trennungen der Kationen und Anionen: Analyse durch Vorproben Lösen und Aufschliessen Trennungsgänge |publisher=Springer-Verlag |date=2013 |isbn=978-3-662-30604-8 |url=https://books.google.de/books?id=as1_BwAAQBAJ&pg=PA97#v=onepage&q&f=false|page=97}}</ref>
:<chem>WO3 + K2S2O7 -> K2WO4 + 2SO3</chem>

== 性质==
钨酸钾是无色无臭固体，<ref name="Alfa" />可溶于水。它存在二水合物。<ref name="Dale L. Perry" />在常温常压下，钨酸钾是[[单斜晶系]]的晶体，空间群C2/m（No. 12）。<ref name="ActaCryst">{{cite journal | last=Koster | first=A. S. | last2=Kools | first2=F. X. N. M. | last3=Rieck | first3=G. D. | title=The crystal structure of potassium tungstate, K 2 WO 4 | journal=Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry | volume=25 | issue=9 | date=1969-09-01 | issn=0567-7408 | doi=10.1107/S0567740869004602 | pages=1704–1708}}</ref>钨酸钾在375&nbsp;°C和455&nbsp;°C时都会发生相变，后者会产生[[六方晶系]]，空间群P63/mmc（No. 194）的晶体。钨酸钾在高压下也会相变，产生另一种[[单斜晶系]]晶体。<ref>{{cite book | last=Tonkov | first=E. Yu | title=High Pressure Phase Transformations Handbook 3 | publisher=CRC Press | publication-place=Philadelphia | date=1996-04-01 | isbn=2-88449-017-5|page=129}}</ref>

== 参考资料==
<references />
{{钾化合物}}
{{钨化合物}}

[[Category:钾化合物]]
[[Category:钨酸盐]]