Tungstic acid: Difference between revisions
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{{Tungsten compounds}} |
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| Name = Tungstic acid |
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| verifiedrevid = 428739474 |
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| ImageFile = |
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| Name = Tungstic acid |
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| ImageFile1 = H2WO4.png |
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| OtherNames = Orthotungstic acid |
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| ImageName1 = Dihydroxy-dioxotungsten |
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| Section1 = {{Chembox Identifiers |
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| ImageFile2 = Tungstic acid.jpg |
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| CASNo = 7783-03-1 |
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| ImageName2 = Yellow tungstic acid sample |
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| CASNo_Ref = {{cascite}} |
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| IUPACName = Tungstic acid |
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| RTECS = |
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| OtherNames = Orthotungstic acid |
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| SystematicName = Dihydroxydioxotungsten |
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| Section2 = {{Chembox Properties |
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| Section1 = {{Chembox Identifiers |
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| Formula = H<sub>2</sub>WO<sub>4</sub> |
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| CASNo = 7783-03-1 |
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| MolarMass = 249.85 g/mol |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| Appearance = yellow powder |
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| UNII_Ref = {{fdacite|changed|FDA}} |
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| Density = 5.59 g/cm<sup>3</sup> |
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| UNII = J4D6K0RX2G |
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| Solubility = insoluble |
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| RTECS = YO7840000 |
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| SolubleOther = soluble in [[hydrofluoric acid|HF]], [[ammonia]] |
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| PubChem = 1152 |
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| MeltingPt = 100 °C (decomp) |
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| InChI = 1S/2H2O.2O.W/h2*1H2;;;/q;;;;+2/p-2 |
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| BoilingPt = |
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| InChIKey = CMPGARWFYBADJI-UHFFFAOYSA-L |
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}} |
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| SMILES = O[W](=O)(=O)O |
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| Section3 = {{Chembox Structure |
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| EINECS = 231-975-2 |
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| Coordination = |
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| ChemSpiderID = 1120 |
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| Section2 = {{Chembox Properties |
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| Formula = H<sub>2</sub>WO<sub>4</sub> |
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| ExternalMSDS = |
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| MolarMass = 249.853 g/mol |
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| Appearance = yellow powder |
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| Density = 5.59 g/cm<sup>3</sup> |
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| Solubility = insoluble |
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| SolubleOther = soluble in [[hydrofluoric acid|HF]], [[ammonia]] <br> slightly soluble in [[ethanol]] |
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| MeltingPtC = 100 |
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| MeltingPt_notes = (decomposes) |
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| NFPA-F = |
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| BoilingPtC = 1473 |
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| NFPA-O = |
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| Section3 = {{Chembox Structure |
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| HPhrases = |
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| NFPA-H = 2 |
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| NFPA-F = 0 |
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| NFPA-R = 0 |
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'''Tungstic acid''' refers to hydrated forms of [[tungsten trioxide]], WO<sub>3</sub>. Both a [[monohydrate]] (WO<sub>3</sub>·H<sub>2</sub>O) and hemihydrate (WO<sub>3</sub>·<sup>1</sup>/<sub>2</sub> 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 [[sulfuric acid]], i.e. (HO)<sub>2</sub>WO<sub>2</sub> are not observed. |
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'''Tungstic acid''' refers to hydrated forms of [[tungsten trioxide]], WO<sub>3</sub>. |
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The simplest form, the [[monohydrate]], is WO<sub>3</sub>.H<sub>2</sub>O, the [[dihydrate]] WO<sub>3</sub>.2H<sub>2</sub>O is also known. 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"> Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications ISBN 0-19-855370-6 </ref> the dihydrate has the same layer structure with the extra H<sub>2</sub>O molecule [[intercalation (chemistry)|intercalated]] between the layers.<ref name = "Wells"/> The monohydrate is a yellow solid and insoluble in water. The classical name for this acid is 'acid of wolfram'. |
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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 [Oxfordshire]|isbn=0-19-855370-6|edition=5th}}</ref> The dihydrate has the same layer structure with the extra H<sub>2</sub>O molecule [[intercalation (chemistry)|intercalated]].<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 [[tungstate]]s. |
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The acid was discovered by [[Carl Wilhelm Scheele]] in 1781.<ref>Scheele, Carl Wilhelm (1781) [https://babel.hathitrust.org/cgi/pt?id=nyp.33433012786798;view=1up;seq=99 "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)</ref> |
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==Preparation== |
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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]].<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> |
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==Uses== |
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It is used as a [[mordant]] and a [[dye]] in textiles. |
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==References== |
==References== |
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{{ |
{{Reflist}} |
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{{Tungsten compounds}} |
{{Tungsten compounds}} |
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{{inorganic-compound-stub}} |
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{{Authority control}} |
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[[Category:Tungstates]] |
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[[Category:Acids]] |
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[[Category:Tungsten compounds]] |
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[[Category:Tungstic acids]] |
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[[cs:Kyselina wolframová]] |
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[[de:Wolframsäure]] |
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[[es:Ácido wolfrámico]] |
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[[ja:タングステン酸]] |
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[[pl:Kwas wolframowy]] |
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[[pt:Ácido túngstico]] |
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[[ru:Вольфрамовая кислота]] |
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[[zh:钨酸]] |
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