Tellurous acid

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Tellurous acid
IUPAC name Tellurous acid
Other names Tellurium dioxide hydrate, tellurium(IV) oxide hydrate
CAS number 10049-23-7
PubChem 24936
Molecular formula H2TeO3
Molar mass 177.616 grams
Appearance colorless crystals
Density ~ 3 g/cm3
Boiling point


Solubility in water negligible
Acidity (pKa) pKa(1) = 2.48, pKa(2) = 7.70
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
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.

It is a weak oxidizing agent and a weak reducing agent. It easily turns back into tellurium dioxide and water. It is a weak acid. It reacts with bases to make tellurites.

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