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Selenite (ion)

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Not to be confused with Selenite (mineral).
Structure of selenite
Space-filling model of selenite

The selenite anion is a selenium oxyanion with the chemical formula SeO2−
3.

A selenite (compound) is a compound that contains this ion.

In slightly acid conditions, the hydrogenselenite ion, HSeO−
3, is formed; in more acidic conditions selenous acid, H2SeO3, exists.

Most selenite salts can be formed by heating the relevant metal oxide with selenium dioxide, e.g.:

Na2O + SeO2 → Na2SeO3.

See Category:Selenites for a list.

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