Iron ores often involve a mixture of oxides and contain both Fe 2+ and Fe 3+ ions.

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Iron ores often involve a mixture of oxides and contain both Fe2+ and Fe3+ ions. Such an ore can be analyzed for its iron content by dissolving it in acidic solution, reducing all the iron to Fe2+ ions, and then titrating with a standard solution of potassium permanganate. In the resulting solution, MnO4 is reduced to Mn2+, and Fe2+ is oxidized to Fe3+. A sample of iron ore weighing 0.3500 g was dissolved in acidic solution, and all the iron was reduced to Fe2+. Then the solution was titrated with a 1.621 × 10–2 M KMnO4 solution. The titration required 41.56 mL of the permanganate solution to reach the light purple (pink) endpoint. Determine the mass percent of iron in the iron ore.

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Chemical Principles

ISBN: 9780618946907

6th Edition

Authors: Steven S Zumdahl

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