Tellurous acid

Tellurous acid
Tellurous acid
Names
IUPAC name
Tellurous acid
Other names
Tellurium dioxide hydrate, tellurium(IV) oxide hydrate
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.030.145 Edit this at Wikidata
UNII
  • InChI=1S/H2O3Te/c1-4(2)3/h(H2,1,2,3) checkY
    Key: SITVSCPRJNYAGV-UHFFFAOYSA-N checkY
  • InChI=1/H2O3Te/c1-4(2)3/h(H2,1,2,3)
    Key: SITVSCPRJNYAGV-UHFFFAOYAI
  • O[Te+]([O-])O
Properties
H2TeO3
Molar mass 177.616 grams
Appearance colorless crystals
Density ~ 3 g/cm3
Boiling point decomposes
negligible
Acidity (pKa) pKa1 = 2.48, pKa2 = 7.70 [1]
Conjugate base Tellurite
Structure
unknown
pyramidal at Te
Related compounds
Other anions
 Selenous acid
Sulfurous acid
Other cations
 Sodium tellurite
Related compounds
 Telluric acid
Selenic acid
Sulfuric acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tellurous acid is an inorganic compound with the formula H2TeO3. It is the oxoacid of tellurium(IV).[2] This 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, that is by hydrolysis. The related conjugate base is well known in the form of several salts such as potassium hydrogen tellurite, KHTeO3.

  1. ^ Cite error: The named reference InorgChem was invoked but never defined (see the help page).
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.