Selenous acid

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Selenous acid[1]
IUPAC name Selenous acid
CAS number 7783-00-8
PubChem 1091
KEGG D05814
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 H2SeO3. It is an acid. It contains hydrogen and selenite ions.

Properties[change | change 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 | change source]

It is made by dissolving selenium dioxide in water.

Uses[change | change source]

It is used to dye steel a blue-grey color. It is used in the making of organic compounds.

Safety[change | change source]

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

Related pages[change | change source]

Sources[change | change source]

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