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|IUPAC name||Tellurous acid|
|Other names||Tellurium dioxide hydrate, tellurium(IV) oxide hydrate|
|Molar mass||177.616 grams|
|Density||~ 3 g/cm3|
|Solubility in water||negligible|
|Acidity (pKa)||pKa(1) = 2.48, pKa(2) = 7.70|
|Molecular shape||pyramidal at Te|
|Other anions|| Selenous acid|
|Other cations||Sodium tellurite|
|Related compounds|| Telluric acid |
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
Tellurous acid is a chemical compound. It is also an acid. Its chemical formula is H2TeO3. It contains hydrogen and tellurite ions. It can be made by reacting tellurium dioxide with water. It is not made as easily as telluric acid.