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Revision as of 17:42, 19 September 2019 editSmokefoot (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers75,093 edits intercalated]] between the layers --> intercalated]] and other nit-picky changes, mainly that (HO)2WO2 is fictional← Previous edit Latest revision as of 11:26, 1 March 2024 edit undoMaxim Masiutin (talk | contribs)Extended confirmed users, IP block exemptions, Pending changes reviewers31,087 edits Altered template type. Add: issue, volume, journal. Parameter name changes. | Use this tool. Report bugs. | #UCB_Gadget 
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{{Chembox {{Chembox
| Verifiedfields = changed | Verifiedfields = changed
| Watchedfields = changed | Watchedfields = changed
| verifiedrevid = 428739474 | verifiedrevid = 428739474
| Name = Tungstic acid | Name = Tungstic acid
| ImageFile =
| ImageFile1 = H2WO4.png | ImageFile1 = H2WO4.png
| ImageName1 = Tungstic acid
⚫ | ImageName1 = Dihydroxy-dioxotungsten
| ImageFile2 = Yellow Tungstic acid.jpg
| ImageName2 = Yellow tungstic acid | ImageFile2 = Tungstic acid.jpg
| ImageName2 = Yellow tungstic acid sample
⚫ | IUPACName = dihydroxy-dioxotungsten
| OtherNames = Orthotungstic acid | IUPACName = Tungstic acid
| OtherNames = Orthotungstic acid
⚫ |Section1={{Chembox Identifiers
| SystematicName = Dihydroxydioxotungsten
⚫ | Section1 = {{Chembox Identifiers
| CASNo = 7783-03-1 | CASNo = 7783-03-1
| CASNo_Ref = {{cascite|correct|CAS}} | CASNo_Ref = {{cascite|correct|CAS}}
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| SMILES = O(=O)(=O)O | SMILES = O(=O)(=O)O
| EINECS = 231-975-2 | EINECS = 231-975-2
| ChemSpiderID = 1120
}} }}
|Section2={{Chembox Properties | Section2 = {{Chembox Properties
| Formula = H<sub>2</sub>WO<sub>4</sub> | Formula = H<sub>2</sub>WO<sub>4</sub>
| MolarMass = 249.853 g/mol | MolarMass = 249.853 g/mol
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| BoilingPtC = 1473 | BoilingPtC = 1473
}} }}
|Section3={{Chembox Structure | Section3 = {{Chembox Structure
| Coordination = | Coordination =
| CrystalStruct = | CrystalStruct =
}} }}
| Section4 =
⚫ |Section7={{Chembox Hazards
| Section5 =
| Section6 =
⚫ | Section7 = {{Chembox Hazards
| ExternalSDS = | ExternalSDS =
| EUClass = | HPhrases =
| RPhrases = | PPhrases =
| SPhrases = | GHS_ref =
| MainHazards = | MainHazards =
| NFPA-H = 2 | NFPA-H = 2
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| FlashPt = | FlashPt =
}} }}
|Section8={{Chembox Related | Section8 = {{Chembox Related
| OtherAnions = | OtherAnions =
| OtherCations = | OtherCations =
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}} }}


'''Tungstic acid''' refers to hydrated forms of ], WO<sub>3</sub>. Both a ] (WO<sub>3</sub>·H<sub>2</sub>O) and ] (WO<sub>3</sub>·2H<sub>2</sub>O) are known. Molecular species akin to sulfuric acid, i.e. (HO)<sub>2</sub>WO<sub>2</sub> are not observed. '''Tungstic acid''' refers to hydrated forms of ], WO<sub>3</sub>. Both a ] (WO<sub>3</sub>·H<sub>2</sub>O) and hemihydrate (WO<sub>3</sub>·<sup>1</sup>/<sub>2</sub>&nbsp;H<sub>2</sub>O)<ref>{{cite journal|doi=10.1016/0025-5408(89)90214-6|title=Direct synthesis and single crystal structure determination of cubic pyrochlore-type tungsten trioxide hemihydrate, WO3 · 0.5H2O|journal=Materials Research Bulletin|volume=24|issue=3|pages=289–292|year=1989|last1=Günter|first1=John R.|last2=Amberg|first2=Marcel|last3=Schmalle|first3=Helmut}}</ref> are known. Molecular species akin to ], i.e. (HO)<sub>2</sub>WO<sub>2</sub> are not observed.


The solid-state structure of WO<sub>3</sub>·H<sub>2</sub>O consists of layers of octahedrally coordinated WO<sub>5</sub>(H<sub>2</sub>O) units where 4 vertices are shared.<ref name="Wells">{{cite book|last=Wells|first=A.F.|title=Structural inorganic chemistry|year=1986|publisher=Clarendon Press|location=Oxford |isbn=0-19-855370-6|edition=5th}}</ref> The dihydrate has the same layer structure with the extra H<sub>2</sub>O molecule ].<ref name="Wells"/> 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 ]s. The solid-state structure of WO<sub>3</sub>·H<sub>2</sub>O consists of layers of octahedrally coordinated WO<sub>5</sub>(H<sub>2</sub>O) units where 4 vertices are shared.<ref name="Wells">{{cite book|last=Wells|first=A.F.|title=Structural inorganic chemistry|year=1986|publisher=Clarendon Press|location=Oxford |isbn=0-19-855370-6|edition=5th}}</ref> The dihydrate has the same layer structure with the extra H<sub>2</sub>O molecule ].<ref name="Wells"/> 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 ]s.
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==Preparation== ==Preparation==
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 ] and ]. It can also be obtained from pure tungsten by reaction with ].<ref name="Murau">{{cite news|last=Murau|first=P. C.|title=Dissolution of Tungsten by Hydrogen Peroxide|year=1961|publisher=Analytical Chemistry|DOI=10.1021/ac60176a021|pages=1125-1126}}</ref> 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 ] and ]. It can also be obtained from pure tungsten by reaction with ].<ref name="Murau">{{cite journal|last=Murau|first=P. C.|title=Dissolution of Tungsten by Hydrogen Peroxide|year=1961|journal=Analytical Chemistry|volume=33 |issue=8 |doi=10.1021/ac60176a021|pages=1125–1126}}</ref>


==Uses== ==Uses==
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{{Authority control}} {{Authority control}}


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{{inorganic-compound-stub}}

Latest revision as of 11:26, 1 March 2024

Tungstic acid
Dihydroxy-dioxotungsten
Dihydroxy-dioxotungsten
Yellow tungstic acid sample
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
  • InChI=1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2Key: CMPGARWFYBADJI-UHFFFAOYSA-L
SMILES
  • O(=O)(=O)O
Properties
Chemical formula H2WO4
Molar mass 249.853 g/mol
Appearance yellow powder
Density 5.59 g/cm
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 , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Tungstic acid refers to hydrated forms of tungsten trioxide, WO3. Both a monohydrate (WO3·H2O) and hemihydrate (WO3·/2 H2O) 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. The dihydrate has the same layer structure with the extra H2O molecule intercalated. 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.

Preparation

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.

Uses

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

References

  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.
  2. ^ Wells, A.F. (1986). Structural inorganic chemistry (5th ed.). Oxford : Clarendon Press. ISBN 0-19-855370-6.
  3. Scheele, Carl Wilhelm (1781) "Tungstens bestånds-delar" (Tungsten's constituents), Kungliga Vetenskaps Academiens Nya Handlingar (Royal Scientific Academy's New Proceedings), 2: 89–95. (in Swedish)
  4. Murau, P. C. (1961). "Dissolution of Tungsten by Hydrogen Peroxide". Analytical Chemistry. 33 (8): 1125–1126. doi:10.1021/ac60176a021.
Tungsten compounds
Tungsten(0)
Tungsten(II)
Tungsten(III)
Tungsten(IV)
Tungsten(V)
Tungsten(VI)
Organotungsten(VI) compounds
Polytungstate salts
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