Tellurous acid

Tellurous acid
IUPAC name Tellurous acid
Other names Tellurium dioxide hydrate, tellurium(IV) oxide hydrate
Identifiers
CAS number	10049-23-7 Y
PubChem	24936
ChemSpider	23310 Y
ChEBI	CHEBI:30465 Y
Jmol-3D images	Image 1
SMILES O=[Te](O)O
InChI InChI=1S/H2O3Te/c1-4(2)3/h(H2,1,2,3) Y Key: SITVSCPRJNYAGV-UHFFFAOYSA-N Y InChI=1/H2O3Te/c1-4(2)3/h(H2,1,2,3) Key: SITVSCPRJNYAGV-UHFFFAOYAI
Properties
Molecular formula	H2TeO3
Molar mass	177.616 grams
Density	~ 3 g/cm3
Boiling point	decomp.
Structure
Crystal structure	unknown
Molecular shape	pyramidal at Te
Related compounds
Other anions	Selenous acid Sulfurous acid
Other cations	Sodium tellurite
Related compounds	Telluric acid Selenic acid Sulfuric acid
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Tellurous acid is an inorganic compound with the formula H₂TeO₃. It is the oxoacid of tellurium(IV).^[1] The compound is not well characterized. An alternative way of writing its formula is (HO)₂TeO. In principle, tellurous acid would form by treatment of tellurium dioxide with water, i.e. hydrolysis. The related conjugate base is well known in the form of several salts such as potassium acid tellurite, KHTeO₃.

Properties

In contrast to the analogous compound Selenous acid, Tellurous acid is only metastable. Most tellurite salts contain the TeO₃^2- ion. Oxidation of its aqueous solution with hydrogen peroxide gives the tellurate ion. It is usually prepared as an aqueous solution where it act as a weak acid.^[2]

References

This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. v t e