Selenous acid

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Selenous acid[1]
Selenous-acid-2D.png
Selenous-acid-from-xtal-1971-3D-balls.png
IUPAC name Selenous acid
Identifiers
CAS number 7783-00-8
PubChem 1091
KEGG D05814
ChEBI CHEBI:26642
SMILES O=[Se](O)O
Properties
Molecular formula H2SeO3
Molar mass 128.97 g/mol
Appearance white hygroscopic crystals
Density 3.0 g/cm3
Melting point

decomposes at 70°C

Solubility in water very soluble
Solubility soluble in ethanol
Related compounds
Other anions selenic acid
hydrogen selenide
Other cations sodium selenite
Related compounds sulfurous acid
tellurous acid
polonous acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Selenous acid, also known as selenious acid, is a chemical compound. Its chemical formula is H2SO3. It is an acid. It contains hydrogen and selenite ions.

Properties[change | edit source]

Selenous acid is a weak acid. It can be heated to make selenium dioxide. It is more stable than sulfurous acid. It can be crystallized as a white solid. It is a weak oxidizing agent. It reacts with bases to make selenites.

Preparation[change | edit source]

It is made by dissolving selenium dioxide in water.

Uses[change | edit source]

It is used in the bluing of steel. It is used in the making of organic compounds.

Safety[change | edit source]

Selenous acid is very toxic. Just ingesting a small amount can kill you.

Related pages[change | edit source]

Sources[change | edit source]

  1. Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). CRC Press. pp. 4–81. ISBN 0-8493-0594-2.