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Ferric oxalate, also known as iron(III) oxalate, refers to inorganic compounds with the formula Fe 2 (C 2 O 4) 3 (H 2 O) x but could also refer to salts of [Fe(C 2 O 4) 3] 3-. Fe 2 (C 2 O 4) 3 (H 2 O) x are coordination polymers with varying degrees of hydration.
Potassium ferrioxalate contains the iron(III) complex [Fe(C 2 O 4) 3] 3−. In chemistry, iron(III) or ferric refers to the element iron in its +3 oxidation state. Ferric chloride is an alternative name for iron(III) chloride (FeCl 3). The adjective ferrous is used instead for iron(II) salts, containing the cation Fe 2+.
When Fe 2 O 3 ·H 2 O is heated, it loses its water of hydration. Further heating at 1670 K converts Fe 2 O 3 to black Fe 3 O 4 (Fe II Fe III 2 O 4), which is known as the mineral magnetite. Fe(O)OH is soluble in acids, giving [Fe(H 2 O) 6] 3+. In concentrated aqueous alkali, Fe 2 O 3 gives [Fe(OH) 6] 3−. [12]
Iron shows the characteristic chemical properties of the transition metals, namely the ability to form variable oxidation states differing by steps of one and a very large coordination and organometallic chemistry: indeed, it was the discovery of an iron compound, ferrocene, that revolutionalized the latter field in the 1950s. [1]
Metallic ions in aqueous solution display many colours: • the red cobalt cation Co 2+ from Co(NO 3) 2 (see § Co) • the orange chromium oxyanion Cr 2 O 2− 7 from K 2 Cr 2 O 7 • the yellow chromium oxyanion CrO 2− 4 from K 2 CrO 4 • the turquoise nickel cation Ni 2+ from NiCl 2
When metallic iron (oxidation state 0) is placed in a solution of hydrochloric acid, iron(II) chloride is formed, with release of hydrogen gas, by the reaction Fe 0 + 2 H + → Fe 2+ + H 2. Iron(II) is oxidized by hydrogen peroxide to iron(III), forming a hydroxyl radical and a hydroxide ion in the process. This is the Fenton reaction.
It often occurs as the trihydrate K 3 [Fe(C 2 O 4) 3]·3H 2 O. Both are crystalline compounds, lime green in colour. [4] The compound is a salt consisting of ferrioxalate anions, [Fe(C 2 O 4) 3] 3−, and potassium cations K +. The anion is a transition metal oxalate complex consisting of an iron atom in the +3 oxidation state and three ...
Ferrioxalate or trisoxalatoferrate(III) is a trivalent anion with formula [Fe(C 2 O 4) 3] 3−. It is a transition metal complex consisting of an iron atom in the +3 oxidation state and three bidentate oxalate ions C 2 O 2− 4 anions acting as ligands. The ferrioxalate anion gives a lime green color to salts, and in solution it is fluorescent.
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