Tungstate


Tungstate

The tungstate ion is WO42−.

A tungstate (compound) is a compound containing the tungstate ion, or more complicated polymeric ions. Tungstates are salts of tungstic acid.

See the for a list of tungstates.

Occurrence

Tungstates occur naturally with . Powellite is a mineral form of calcium molybdate containing a small extent of tungstate, and scheelite is a mineral form of calcium tungstate containing a small extent of molybdate. Wolframite is manganese and iron tungstate, and all these are valuable sources of tungsten.

Chemical and physical properties

Solutions of tungstates, like those of , give intensely blue solutions of complex tungstate(V,VI) analoguous to the molybdenum blues when reduced by most organic materials. Therefore it could be used to trace paths of solutes in chromatography in which the solute (usually organic if used for this purpose) is colourless.

Tungstate can also be used as an oxidizing agent in the oxidation of cyclohexene. The tungstate can be constantly regenerated through the presence of hydrogen peroxide.

Unlike chromate, tungstate is not a good oxidizer, but like chromate, it polymerizes in acid and depolymerizes back to tungstates in alkaline solutions.

References


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Look at other dictionaries:

  • 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

  • Tungstate — Tung state, n. [Cf. F. tungstate.] (Chem.) A salt of tungstic acid; a wolframate. [1913 Webster] …   The Collaborative International Dictionary of English

  • tungstaté — tungstaté, ée (tongh sta té, tée) adj. Qui contient du tungstène. Chaux tungstatée …   Dictionnaire de la Langue Française d'Émile Littré

  • tungstate — [tuŋ′stāt΄] n. a salt or ester of tungstic acid …   English World dictionary

  • tungstate — noun Date: 1800 a salt or ester of a tungstic acid and especially of H2WO4 …   New Collegiate Dictionary

  • tungstate — /tung stayt/, n. Chem. a salt of any tungstic acid. Also called wolframate. [1790 1800; TUNGST(IC ACID) + ATE2] * * * …   Universalium

  • tungstate — noun any salt of tungstic acid …   Wiktionary

  • tungstate — An anionic form of tungsten. calcium t. a phosphor with a high stopping power for x rays that was formerly used widely in fluoroscopic screens and intensifying screens for radiography …   Medical dictionary

  • tungstate — (tongh sta t ) s. m. Terme de chimie. Sel produit par la combinaison de l acide tungstigue avec une base …   Dictionnaire de la Langue Française d'Émile Littré

  • tungstate — tung·state || tʌŋsteɪt n. salt of a tungstic acid (Chemistry) …   English contemporary dictionary


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