raudIIhüdroksiidi

Raud(II)hüdroksiid, also known as ferrous hydroxide, is an inorganic compound with the chemical formula Fe(OH)2. It is a white precipitate that is insoluble in water. In the presence of air, iron(II) hydroxide rapidly oxidizes to form iron(III) hydroxide, Fe(OH)3, which is reddish-brown. This oxidation is a common reason why freshly precipitated Fe(OH)2 quickly changes color.

The preparation of iron(II) hydroxide typically involves reacting a soluble iron(II) salt, such as iron(II) sulfate or iron(II) chloride, with a strong base like sodium hydroxide. The reaction is usually carried out under an inert atmosphere, such as nitrogen, to prevent premature oxidation. The balanced chemical equation for the reaction with sodium hydroxide is: FeSO4(aq) + 2NaOH(aq) -> Fe(OH)2(s) + Na2SO4(aq).

Iron(II) hydroxide is a moderately strong base. It can react with acids to form iron(II) salts and water. Its role in environmental chemistry is significant, particularly in the context of water treatment and the biogeochemical cycling of iron. It plays a part in the precipitation and dissolution of iron in natural aquatic systems. While not a commonly used industrial chemical on its own, its properties are relevant to understanding iron chemistry in various contexts.