Iron(II) hydroxide

• Eisendihydroxid
• Iron hydroxide ( ambiguous )

White solid

Fixed

3.4 g · cm -3

Soluble in hydrochloric acid, concentrated sulfuric acid, hydrofluoric acid

Template: Infobox chemical / molecular formula search available

Iron ( II) hydroxide is an inorganic chemical compound from the group of iron hydroxides.

Production and representation

Iron (II) - hydroxide obtained by precipitation of iron (II ) salt solution with exclusion of oxygen ( for example, ammonium iron (II ) sulphate solution with aqueous sodium hydroxide ). But the white flocculent precipitate turns dark quickly to form iron (III ) oxide hydroxide.

It is also formed as an intermediate in the rusting of iron, and it (OH ) reacted further as a result of atmospheric oxygen on hydrous iron (III ) hydroxide FeO to reddish-brown iron (III ) oxide or lack of oxygen to green magnetite hydrate and black magnetite will.

Properties

Iron (II ) hydroxide is an almost white, unstable in air, solid low, greenish approach. It burns when spreading in the air with sparks. In the absence of oxygen purity, in particular nickel, copper and cobalt -free preparations in contact with potassium chloride solution below 100 ° C are completely stable. The compound has a crystal structure of cadmium (II ) hydroxide - type with the space group C3m (a = 325.8 pm, c = 460.5 pm ). Iron (II ) hydroxide is amphoteric and dissolves in concentrated alkalis with the formation of blue-green Hydroxoferraten (II ), eg Na4 [Fe ( OH) 6].