Sodium tungstate


Sodium tungstate

Sodium tungstate, Na2WO4, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.

It is often found as the dihydrate, Na2WO4•2H2O. This salt is soluble in water and is a moderately strong oxidizing agent, but finds no common use in the chemistry laboratory. Like the molybdate, the deep-coloured complex tungstate(VI,V) is formed on reducing the compound with a very mild reducing agent, such as complex organic compounds. It is also thought to be a possible inhibitor of protein-tyrosine phosphatase (PTPase).Fact|date=November 2007It is also sometimes used as a fireproofing agent.

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

References


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  • sodium tungstate — noun or sodium wolframate : a tungstate of sodium; especially : the normal salt Na2WO4 that commonly crystallizes with two molecules of water, is usually obtained during the extraction of tungsten from its ores, and is used chiefly in making… …   Useful english dictionary

  • Sodium molybdate — Sodium molybdate …   Wikipedia

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  • sodium wolframate — noun see sodium tungstate …   Useful english dictionary

  • tungstate — [ tœ̃kstat ] n. m. • 1789; de tungstène ♦ Chim. Sel renfermant l anion WO4. Tungstate de sodium (Na2WO4). ⇒ wolfram. ● tungstate nom masculin Sel d un acide tungstique. ● tungstate (synonymes) nom masculin Sel d un acide tungstique. Synonymes …   Encyclopédie Universelle

  • calcium tungstate — noun : a white crystalline salt CaWO4 found in nature as scheelite and used chiefly in screens for radiography, in luminous paint, and in fluorescent lamps * * * calcium tungstate, a white powder occurring naturally as scheelite and produced… …   Useful english dictionary

  • tungsten processing — Introduction       preparation of the ore for use in various products.       Tungsten exhibits a body centred cubic (bcc) crystal lattice. It has the highest melting point of all metals, 3,410° C (6,170° F), and it has high conductivity for… …   Universalium

  • tungsten — tungstenic /tung sten ik/, adj. /tung steuhn/, n. Chem. a rare, metallic element having a bright gray color, a metallic luster, and a high melting point, 3410° C, and found in wolframite, tungstite, and other minerals: used in alloys of high… …   Universalium

  • Phosphotungstic acid — Chembox new Name = Phosphotungstic acid ImageFile = Phosphotungstate 3D polyhedra.png ImageName = Structure of the phosphotungstate anion OtherNames = PTA, TPA, tungstophosphoric acid Section1 = Chembox Identifiers CASNo = 12067 99 1 Section2 =… …   Wikipedia


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