Barium ferrate

Red-violet solid

Fixed

Insoluble in water

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Bariumferrat (VI) is a chemical compound having the formula BaFeO4. It contains iron in the most currently known oxidation state 6. Bariumferrat is isomorphous with barium sulfate ( BaSO4 ) and contains the ferrate ion FeO42, wherein the iron is tetrahedrally surrounded by four oxygen atoms.

History

Bariumferrat was first produced in 1843 by Heinrich Rose and examined, further research was carried out in 1871 by J. de Mollins and L. Moeser 1897.

Representation

Ferrate are generally obtained by oxidizing an iron compound or elemental iron by means of a strong oxidizing agent. Thus, by annealing of iron with potassium nitrate potassium ferrate is obtained which can be solved by cooling, by leaching into ice water. However, the reaction is not quantitative, it will thereby also iron oxides formed which settle as the insoluble residue at the bottom of the vessel. From the filtrate kaliumferrathaltigem this solution, the Bariumferrat must be immediately precipitated with barium chloride, otherwise decomposed ferrate formed rapidly. The precipitate is then washed first with water with aldehyde-free ethanol and then dried in a vacuum desiccator.

Properties

Bariumferrat occurs as the monohydrate BaFeO4 · H2O.

Bariumferrat is equal to all ferrates a strong oxidizing agent, which surpasses example, the permanganate in its oxidizing power. ( Normal potential for Fe3 / - FeO42 at pH 0: 2.2 V; at pH 14: 0.55 V). In the acidic range, the ferrate ion immediately reacts with water to precipitation of iron ( III) oxide and oxygen.