Is FeOH3 soluble

Iron hydroxides

Iron hydroxides. Ferrous hydroxide, Fe (OH)2, white compound, accessible by precipitation from iron (II) salt solutions with alkali lye in the absence of air, which in the air quickly converts to iron (III) hydroxide via gray-dark green and blackish intermediate products. Fe (OH)2 is soluble in acids, but also reacts with conc. boiling alkalis to a small extent to hydroxoferrates (II), M4Fe (OH)6].

Ferric hydroxide, Fe2O3 Â ·x H2O [iron (III) oxide hydrate], a water-rich hydrogel, which is formed when iron (III) salt solutions are precipitated with alkali or ammonia and when dried via condensation reactions into crystalline α-Fe2O3, occurring in nature as hematite, passes over. Iron (III) hydroxide is used as a pigment (iron oxide) under the names iron oxide yellow or iron yellow. When freshly precipitated iron (III) oxide hydrate is heated in 2N sodium hydroxide solution with superheated steam, it is formed Ferric oxide hydroxide, α-FeO ​​(OH), D. 4.28 g cm-3which occurs in nature as goethite (needle iron ore). An inconsistent modification of FeOOH is γ-FeO (OH), which crystallizes in red flakes; it appears as rust during corrosion processes. This modification occurs in nature as lepidocrolite (ruby mica). The high adsorption capacity of freshly precipitated iron (III) oxide hydrate is z. B. used in water purification.