In chemistry, plumbite is the PbO2−2 oxyanion or hydrated forms, or any salt containing this anion.
In these salts, lead is in the oxidation state +2.
It is the traditional term for the IUPAC name plumbate(II).
For example, lead(II) oxide (PbO) dissolves in alkali to form salts containing the HPbO−2 anion (hydrogen plumbite):[1] Lead(II) hydroxide also dissolves in excess alkali to form the [Pb(OH)6]4− anion (hexahydroxyplumbate(II)):[2] The plumbite ion is a weak reducing agent.
When it functions as one, it is oxidized to the plumbate ion.