Tungstic acid

  • Tungsten ( VI) oxide monohydrate
  • Scheel acid

Yellow solid

Fixed

5.5 g · cm -3

3.5; 4.6

  • Insoluble in water and acids
  • Soluble in alkalis

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Tungstic acid (more precisely, ortho -tungstic acid ) is a compound of tungsten trioxide and water.

Production and representation

Tungstic acid produced, among others, upon acidification of tungstate solutions and careful heating of the initially failing dihydrate ( WO 3 · 2 H2O).

Thus, for example, by reaction of calcium tungstate having a mixture of concentrated hydrochloric acid and nitric acid.

Properties

The empirical formula of tungsten trioxide monohydrate is H2WO4, but exist in contrast to the seemingly analog based sulfuric acid ( H2SO4) no discrete H2WO4 molecules. Instead, there is tungstic acid from a layer lattice from WO6 octahedra. The anions of the tungstic acid exist, however, analogous to the sulfate ions from WO42 - tetrahedra. It was first isolated by Carl Wilhelm Scheele in 1781 in Köpings.

CAS registry number PubChem Integrated Authority File
288935
de