Raudhüdroksiidid

Raudhüdroksiidid, specifically raud(II)hüdroksiid (Fe(OH)2) and raud(III)hüdroksiid (Fe(OH)3), are chemical compounds formed when iron ions react with hydroxide ions. Raud(II)hüdroksiid, also known as ferrous hydroxide, is a white precipitate that is insoluble in water. It is formed by the reaction of soluble iron(II) salts with a strong base. In the presence of oxygen, raud(II)hüdroksiid quickly oxidizes to raud(III)hüdroksiid.

Raud(III)hüdroksiid, also known as ferric hydroxide, is a reddish-brown to yellowish-brown precipitate. It is generally more stable than raud(II)hüdroksiid and is formed from soluble iron(III) salts and a strong base. Raud(III)hüdroksiid exists in various hydrated forms, often represented as Fe2O3·nH2O. These hydrated forms are commonly referred to as rust.

Both raud(II)hüdroksiid and raud(III)hüdroksiid have limited solubility in pure water but can dissolve in acidic solutions due to the reaction of hydroxide ions with protons. They are important in various chemical processes, including water treatment and the formation of iron oxides. The presence of these compounds is also significant in geochemistry and environmental science, particularly in the context of iron cycling in natural environments and the corrosion of iron.