Iron(II) hydroxide
Iron(II) hydroxide or ferrous hydroxide is an inorganic compound with the formula Fe(OH). It is produced when iron(II) salts, from a compound such as iron(II) sulfate, are treated with hydroxide ions. Iron(II) hydroxide is a white solid, but even traces of oxygen impart a greenish tinge. The air-oxidized solid is sometimes known as "green rust".
Properties of water
Other systematic names for water include "hydroxic acid", "hydroxylic acid", and "hydrogen hydroxide", using acid and base names. None of these exotic names are used widely. The polarized form of the water molecule, , is also called hydron hydroxide by IUPAC nomenclature.