Question

2.83g of a sample of haematite iron ore [iron (III) oxide,Fe2O3] were dissolved in

of iron(II) ions.This solution of iron(II) ions required26.4cm3

concentrated hydrochloric acid and the solution diluted to250cm3

was reduced with tin(II) chloride (which is oxidised to Sn4+in the process) to form a solution

potassium

of a0.0200mol/dm3

.25.0cm3of this solution

dichromate(VI) solution for complete oxidation back to iron(III) ions.

Answer 1

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