Tellurous acid
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.
| Tellurous acid | |
|---|---|
| |
| IUPAC name | Tellurous acid |
| Other names | Tellurium dioxide hydrate, tellurium(IV) oxide hydrate |
| Identifiers | |
| CAS number | |
| PubChem | |
| ChEBI | CHEBI:30465 |
| SMILES | O=[Te](O)O |
| Properties | |
| 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 |
| 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 |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
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.
