Most Common Iron Compounds and Their Uses

The three most iron compounds are ferrous oxide, ferric oxide, and ferrosoferric oxide, or ferroferric oxide.

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All three iron compounds mentioned contain iron in +2 or +3 oxidation states.

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The molecular formula of ferrous oxide is FeO and its molecular weight is 71.84 g/mol.

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It is used in green, heat-absorbing glasses.

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The molecular formula of ferric oxide is Fe2O3 and its molecular weight is 159.69 g/mol. It appears reddish-brown in color.

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It is used in paint coatings, rubber products, inks, plastics, and as UV blocking agents in glasses. It can be used as a polishing agent for glass and diamonds.

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Fe3O4 is the molecular formula of ferroferric oxide and has a molecular weight of 231.533 g/mol.

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Ferroferric oxide is obtained by passing steam over red-hot iron.

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It is used in a few computer memories and used as coatings for magnetic tape.

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