Selenite (ion)

The selenite anion is a selenium oxyanion with the chemical formula . It is the selenium analog of the sulfite ion, .
A selenite (compound) is a compound that contains this ion.
In slightly acid conditions, the hydrogenselenite ion, , 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.:
The boroselenites have a more complex oxyanion also including boron.
See for a list.