Tellurite

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Tellurites are the salts of telluric acid and have the common tellurite anion TeO 3 2− . The mineral made up of tellurium dioxide , TeO 2 , is called tellurite and is the anhydride of telluric acid.

The tellurite anion, like the selenite and sulfite anions, is pyramidal and has C 3v symmetry.

Telluric acid, H 2 TeO 3 , is weakly amphoteric . When adding bases, hydrogen tellurites , HTeO 3 - and tellurites, TeO 3 2− are formed (pK 1 = 2.48, pK 2 = 7.70).

In addition to the monotellurites, polytellurites are also known: K 2 Te 2 O 5 , K 2 Te 4 O 9 , K 2 Te 6 O 13 .

Potassium tellurite is used to indicate diphtheria bacteria in the Clauberg culture medium .

literature

  • MR Masson, HD Lutz and B. Engelen (eds.): Sulfites, Selenites and Tellurites. Pergamon Press, Oxford 1986.
  • Hollemann-Wiberg: Textbook of inorganic chemistry. 101st edition. Walter de Gruyter, Berlin, New York 1995.