Jump to content
 







Main menu
    


Navigation  


●Main page
 ●Contents
 ●Current events
 ●Random article
 ●About Wikipedia
 ●Contact us
 ●Donate
  



Contribute  


●Help
 ●Learn to edit
 ●Community portal
 ●Recent changes
 ●Upload file
  







Search  

































●Create account

●Log in
 









●Create account
 ● Log in
  



Pages for logged out editors learn more  


●Contributions
 ●Talk
  


















Contents

   



(Top)
  


1 Preparation  




2 Uses  




3 References  













Tungstic acid






●تۆرکجه
 ●Čeština
 ●Deutsch
 ●Español
 ●فارسی
 ●Français
 ●한국어
 ●हिन्दी
 ●Italiano
 ●Кыргызча
 ●Nederlands
 ●日本語
 ●Polski
 ●Português
 ●Română
 ●Русский
 ●Српски / srpski
 ●Srpskohrvatski / српскохрватски
 ●Suomi
 ●Tiếng Việt
 ●中文
  
Edit links
  








●Article
 ●Talk
  
















●Read
 ●Edit
 ●View history
  







Tools
    


Actions  


●Read
 ●Edit
 ●View history
  



General  


●What links here
 ●Related changes
 ●Upload file
 ●Special pages
 ●Permanent link
 ●Page information
 ●Cite this page
 ●Get shortened URL
 ●Download QR code
 ●Wikidata item
  



Print/export  


●Download as PDF
 ●Printable version
  



In other projects  


●Wikimedia Commons
  















Appearance
    

 





From Wikipedia, the free encyclopedia
  

Tungstic acid
Dihydroxy-dioxotungsten
Yellow tungstic acid sample
Names
IUPAC name

Tungstic acid

Systematic IUPAC name

Dihydroxydioxotungsten

Other names

Orthotungstic acid

Identifiers

CAS Number

3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.068 Edit this at Wikidata
EC Number
  • 231-975-2

PubChem CID
RTECS number
  • YO7840000
UNII

CompTox Dashboard (EPA)

  • InChI=1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2

    Key: CMPGARWFYBADJI-UHFFFAOYSA-L

  • O[W](=O)(=O)O

Properties

Chemical formula

 H2WO4
Molar mass 249.853 g/mol
Appearance yellow powder
Density 5.59 g/cm3
Melting point 100 °C (212 °F; 373 K) (decomposes)
Boiling point 1,473 °C (2,683 °F; 1,746 K)

Solubility in water

 insoluble
Solubility soluble in HF, ammonia
slightly soluble in ethanol
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

☒N verify (what is checkY☒N ?)

Infobox references

Tungstic acid refers to hydrated forms of tungsten trioxide, WO3. Both a monohydrate (WO3·H2O) and hemihydrate (WO3·1/2 H2O)[1] are known. Molecular species akin to sulfuric acid, i.e. (HO)2WO2 are not observed.

The solid-state structure of WO3·H2O consists of layers of octahedrally coordinated WO5(H2O) units where 4 vertices are shared.[2] The dihydrate has the same layer structure with the extra H2O molecule intercalated.[2] The monohydrate is a yellow solid and insoluble in water. The classical name for this acid is 'acid of wolfram'. Salts of tungstic acid are tungstates.

The acid was discovered by Carl Wilhelm Scheele in 1781.[3]

Preparation[edit]

Tungstic acid is obtained by the action of strong acids on solutions of alkali metallic tungstates. It may also be prepared from the reaction between hydrogen carbonate and sodium tungstate. It can also be obtained from pure tungsten by reaction with hydrogen peroxide.[4]

Uses[edit]

It is used as a mordant and a dye in textiles.

References[edit]

  1. ^ Günter, John R.; Amberg, Marcel; Schmalle, Helmut (1989). "Direct synthesis and single crystal structure determination of cubic pyrochlore-type tungsten trioxide hemihydrate, WO3 · 0.5H2O". Materials Research Bulletin. 24 (3): 289–292. doi:10.1016/0025-5408(89)90214-6.
  • ^ a b Wells, A.F. (1986). Structural inorganic chemistry (5th ed.). Oxford [Oxfordshire]: Clarendon Press. ISBN 0-19-855370-6.
  • ^ Scheele, Carl Wilhelm (1781) "Tungstens bestånds-delar" (Tungsten's [i.e., Scheelite's] constituents), Kungliga Vetenskaps Academiens Nya Handlingar (Royal Scientific Academy's New Proceedings), 2: 89–95. (in Swedish)
  • ^ Murau, P. C. (1961). "Dissolution of Tungsten by Hydrogen Peroxide". Analytical Chemistry. 33 (8): 1125–1126. doi:10.1021/ac60176a021.

    • Retrieved from "https://en.wikipedia.org/w/index.php?title=Tungstic_acid&oldid=1211211102"
    Category: 
    ●Tungstic acids
     Hidden categories: 
    ●Articles without EBI source
     ●Articles without KEGG source
     ●ECHA InfoCard ID from Wikidata
     ●Articles with changed FDA identifier
     ●Articles containing unverified chemical infoboxes
     ●Articles with short description
     ●Short description matches Wikidata
     ●Articles with GND identifiers
     ●Articles with J9U identifiers
     ●Articles with LCCN identifiers
      


    ●This page was last edited on 1 March 2024, at 11:26 (UTC).
    ●Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.


    ●Privacy policy
    ●About Wikipedia
    ●Disclaimers
    ●Contact Wikipedia
    ●Code of Conduct
    ●Developers
    ●Statistics
    ●Cookie statement
    ●Mobile view


    Wikimedia Foundation
    Powered by MediaWiki