World Library  
Flag as Inappropriate
Email this Article

Sodium tungstate

Article Id: WHEBN0002845376
Reproduction Date:

Title: Sodium tungstate  
Author: World Heritage Encyclopedia
Language: English
Subject: Sodium molybdate, Sodium chromate, Tungsten, Tungsten compounds, 2-Methyl-2-nitrosopropane
Collection: Sodium Compounds, Tungstates, Tungsten Compounds
Publisher: World Heritage Encyclopedia

Sodium tungstate

Sodium tungstate
Sodium tungstate
IUPAC name
Sodium tungstate
Jmol-3D images Image
RTECS number YO7875000
Molar mass 293.82 g·mol−1
Appearance white rhombohedral crystals
Density 4.179 g/cm3 (anhydrous)
3.25 g/cm3 (dihydrate)
Melting point 698 °C (1,288 °F; 971 K)
57.5 g/100 mL (0 °C)
74.2 g/100 mL (25 °C)
96.9 g/100 mL (100 °C)
Solubility slightly soluble in ammonia
insoluble in alcohol, acid
rhombic (anhydrous)
orthorhombic (dihydrate)
Safety data sheet External MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Sodium tungstate is the sodium salt of tungstic acid. It is useful as a source of tungsten for chemical synthesis. It is an intermediate in the conversion of tungsten ores to the metal.[1]


  • Preparation and structure 1
  • Reactions 2
  • Uses 3
  • References 4
  • External links 5

Preparation and structure

The predominant route to this salt is the extraction of tungsten ores, almost all of which are tungstates. Thus, the ores are treated with a base to give sodium tungstate, as illustrated in the case of wolframite:[1]

Fe/MnWO4 + 2 NaOH + 2 H2O → Na2WO4•2H2O + Fe/Mn(OH)2

Scheelite is treated similarly using sodium carbonate.

Sodium tungstate can also be produced by treating tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.

Several polymorphs of sodium tungstate are known, three at only one atmosphere pressure. They feature tetrahedral orthotungstate dianions but differ in the packing motif. The WO42− anion adopts a structure like sulfate (SO42−).[2]


Treatment of sodium tungstate with hydrochloric acid gives the trioxide:

Na2WO4 + 2 HCl → WO3 + 2 NaCl + H2O

This reaction can be reversed using aqueous solution of sodium hydroxide


In organic chemistry, sodium tungstate is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones.

It is also known for its anti-diabetic effects; researchers have identified the pathways through which sodium tungstate improves pancreatic function and beta cell proliferation.[3]


  1. ^ a b Erik Lassner, Wolf-Dieter Schubert, Eberhard Lüderitz, Hans Uwe Wolf, "Tungsten, Tungsten Alloys, and Tungsten Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim. doi:10.1002/14356007.a27_229.
  2. ^ Carl W. F. T. Pistorius "Phase Diagrams of Sodium Tungstate and Sodium Molybdate to 45 kbar" J. Chem. Phys. 1966, volume 44, 4532.doi:10.1063/1.1726669
  3. ^ The Antidiabetic Agent Sodium Tungstate Activates Glycogen Synthesis through an Insulin Receptor-independent Pathway. The Journal of Biological Chemistry, Vol. 278, No. 44, Issue of October 31, pp. 42785–42794, 2003.

External links

  • The Anti-Diabetic Effects Of Sodium Tungstate Revealed, ScienceDaily, Aug. 28, 2009
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.