Tellurite (ion)

Tellurite (ion)
Names
Systematic IUPAC name
Tellurite[1] (substitutive)
Trioxidotellurate(2−)[2] (additive)
Identifiers
15852-22-9
ChEBI CHEBI:30477
ChemSpider 102958 YesY
100741
Jmol 3D image Interactive graph
PubChem 115037
Properties
O3Te2−
Molar mass 175.6 g mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The tellurite ion is TeO2−
3. A tellurite (compound), for example sodium tellurite, is a compound that contains this ion. Tellurites are highly stable tellurium compounds, although they can be reduced to elemental tellurium by electrolysis or a strong reducing agent.

Acidified forms

In slightly acidic conditions, hydrogen tellurite ion, HTeO−
3, is prevalent; with more acidic conditions tellurous acid, H2TeO3, is prevalent. Only in basic conditions is tellurite formed.

Preparation

Most tellurite compounds can be formed by heating the relevant oxide with tellurium dioxide, e.g., Na2O + TeO2 → Na2TeO3.

Uses

Potassium tellurite (K2TeO3) is used together with agar as part of a selective medium for growth of some bacteria (Clauberg medium). Corynebacteria and some other species reduce TeO2−
3 to elemental Te, which stains the bacteria black.

See also

References

  1. ↑ "Tellurous Acid - PubChem Public Chemical Database". The PubChem Project. USA: National Center for Biotechnology Information.
  2. ↑ "Tellurite (CHEBI:30477)". Chemical Entities of Biological Interest (ChEBI). UK: European Bioinformatics Institute.


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