|IUPAC name||Selenous acid|
|Molar mass||128.97 g/mol|
|Appearance||white hygroscopic crystals|
decomposes at 70°C
|Solubility in water||very soluble|
|Solubility||soluble in ethanol|
|Other anions||selenic acid
|Other cations||sodium selenite|
|Related compounds||sulfurous acid
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
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.