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A sample of the mineral haematite contains iron(III) oxide Fe2O3 combined with inert material. A 1g portion of the sample is taken from analysis. The iron(III) in the sample is first reduced to iron(II) by dissolving in 100.0mL(an excess) of potassium iodide. A 25.00mL aliquot of the resultant solution is then titrated against 0.1 M sodium thiosulphate. Calculate the percentage content of iron(III) oxide by mass in the haematite if 30.30mL of thiosulphate are required for the titration.
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