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

●Create account ●Log in ●Create account ● Log in Pages for logged out editors learn more ●Contributions ●Talk

(Top) 1 References 2 Further reading

Sodium metatungstate

Add 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 Appearance From Wikipedia, the free encyclopedia

Sodium metatungstate
Identifiers
CAS Number	314075-43-9
3D model (JSmol)	Interactive image
EC Number	412-770-9
PubChem CID	71311259
InChI InChI=1S/6Na.H2O.39O.12W/h;;;;;;1H2;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;/q6+1;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;6-1;;;;;;;;;;;; Key: YVQUUPJGDSQKML-UHFFFAOYSA-N
SMILES O.[O-][W](=O)(=O)[O-].[O-][W](=O)(=O)[O-].[O-][W](=O)(=O)[O-].O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.O=[W](=O)=O.[Na+].[Na+].[Na+].[Na+].[Na+].[Na+]
Properties
Chemical formula	H₂Na₆O₄₀W₁₂
Molar mass	2985.99 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

The [W₁₂O₄₀]^8- cage. Metatungstates feature the doubly protonated derivative of this cage, i.e. [H₂W₁₂O₄₀]^6-.^[1]

Sodium metatungstate is the inorganic compound with the formula Na₆[H₂W₁₂O₄₀], sometimes written 3Na₂WO₄·9WO₃·H₂O. It is also referred to as sodium polytungstate (SPT). This salt has been used in the manufacture of dense aqueous solutions. Sodium metatungstate exists as white solid. The anion is the polyoxotungstate [H₂W₁₂O₄₀]^6-, which features six-coordinated tungsten(VI) centers interconnected with doubly- and triply bridging oxo ligands.

Due to its very high solubility in water (max. density 3.1 g/cm³), SPT is widely used as to produce "heavy liquid" for gravity separation (sink /float analysis) and density gradient centrifugation. It has significant advantages when compared to zinc chloride solution or the toxic halogenated carbons for sink-swim analysis. Aqueous SPT is non-toxic (unlike the denser Clerici solution), non-flammable, odorless, reusable and additionally it has a low viscosity.^[2]

References[edit]

^ Asami, M.; Ichida, H.; Sasaki, Y. (1984). "The structure of hexakis(tetramethylammonium) dihydrogendodecatungstate enneahydrate, [(CH3)4N]6[H2W12O40].9H2O". Acta Crystallographica Section C. 40 (1): 35–37. Bibcode:1984AcCrC..40...35A. doi:10.1107/S0108270184002924.

^ Munsterman, Dirk; Kerstholt, Susan (1996). "Sodium polytungstate, a new non-toxic alternative to bromoform in heavy liquid separation". Review of Palaeobotany and Palynology. 91 (1–4): 417–422. Bibcode:1996RPaPa..91..417M. doi:10.1016/0034-6667(95)00093-3.

Further reading[edit]

Gregory, Murray R.; Johnston, Keith A. (1987). "A nontoxic substitute for hazardous heavy liquids—aqueous sodium polytungstate (3Na2WO4.9WO3.H2O) solution (Note)". New Zealand Journal of Geology and Geophysics. 30 (3): 317. Bibcode:1987NZJGG..30..317G. doi:10.1080/00288306.1987.10552626.
Bolch, C. J. S. (1997). "The use of sodium polytungstate for the separation and concentration of living dinoflagellate cysts from marine sediments". Phycologia. 36 (6): 472–478. Bibcode:1997Phyco..36..472B. doi:10.2216/i0031-8884-36-6-472.1.
Six, J (1999). "Recycling of sodium polytungstate used in soil organic matter studies". Soil Biology and Biochemistry. 31 (8): 1193–1196. doi:10.1016/S0038-0717(99)00023-1.
Savage, N. M. (1988). "The use of sodium polytungstate for conodont separations" (PDF). Journal of Micropalaeontology. 7 (1): 39–40. Bibcode:1988JMicP...7...39S. doi:10.1144/jm.7.1.39. S2CID 129701930.

Sodium compounds

Inorganic

Halides	NaF NaHF₂ NaCl NaBr NaI NaAt
Chalcogenides	NaO₃ NaO₂ Na₂O Na₂O₂ NaOH NaOD Na₂S NaSH Na₂Se NaSeH Na₂Te NaHTe Na₂Po
Pnictogenides	Na₃N NaN₃ NaNH₂ Na₃P Na₃As
Oxyhalides	NaClO NaClO₂ NaClO₃ NaClO₄ NaBrO NaBrO₂ NaBrO₃ NaBrO₄ NaIO₃ NaIO₄
Oxychalcogenides	Na₂SO₃ Na₂SO₄ NaHSO₃ NaHSO₄ Na₂S₂O₃ Na₂S₂O₄ Na₂S₂O₅ Na₂S₂O₆ Na₂S₂O₇ Na₂S₂O₈ Na₂SeO₃ Na₂SeO₄ NaHSeO₃ Na₂TeO₃
Oxypnictogenides	NaNO₂ NaNO₃ Na₂N₂O₂ NaH₂PO₄ NaPO₂H₂ Na₂HPO₃ Na₂PO₃F Na₃PS₂O₂ Na₃PO₄ Na₅P₃O₁₀ Na₄P₂O₇ Na₂H₂P₂O₇ Na₃AsO₃ Na₃AsO₄ Na₂HAsO₄ NaH₂AsO₄ NaSbO₃
Others	NaAlH₄ NaAlO₂ Na₃AlF₆ NaAl(SO₄)₂ NaAuCl₄ NaSbF₆ NaAsF₆ Na₂TiF₆ NaBH₄ NaBH₃(CN) NaBO₂ Na₂B₄O₇ Na₂B₂O₉ Na₂B₈O₁₃ NaBiO₃ NaCN NaCNO NaCoO₂ NaH NaHCO₃ Na₄XeO₆ NaHXeO₄ NaMnO₄ NaOCN NaReO₄ NaSCN NaTcO₃ NaTcO₄ NaVO₃ Na₂CO₃ Na₂C₂O₄ Na₂C₃S₅ Na₂CrO₄ Na₂Cr₂O₇ Na₂Cr₃O₁₀ Na₂GeO₃ Na₂He Na₂[Fe(CO)₄] Na₂MnO₄ Na₂MoO₄ Na₃IrCl₆ Na₂PtCl₆ Na₂O(UO₃)₂ Na₂S₄O₆ Na₂SiO₃ Na₂TiO₃ Na₂U₂O₇ Na₂WO₄ Na₂Zn(OH)₄ Na₃VO₄ Na₆V₁₀O₂₈ Na₄Fe(CN)₆ Na₃Fe(CN)₆ Na₃Fe(C₂O₄)₃ Na₄SiO₄ Na₂SiF₆ Na₃[Co(NO₂)₆] NaNSi₂(CH₃)₆ Na₂PdCl₄

Organic

Retrieved from "https://en.wikipedia.org/w/index.php?title=Sodium_metatungstate&oldid=1198589051" Categories: ●Sodium compounds ●Tungstates Hidden categories: ●Articles without InChI source ●Chemical pages without ChemSpiderID ●Articles without EBI source ●Articles without KEGG source ●Articles without UNII source ●Articles containing unverified chemical infoboxes ●Chembox articles without image ●Articles with short description ●Short description matches Wikidata ●This page was last edited on 24 January 2024, at 14:14 (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