When 25.0 mL of a solution containing both Fe2+ and Fe3+ ions is titrated with 23.0 mL of 0.0200M KMnO4 (in dilute sulfuric acid), ail the Fe2+ ions are oxidized to Fe3+ ions. Next, the solution is treated with Zn metal to convert all the Fe3+ ions to Fe2+ ions. Finally. 40.0 mL of the same KMnO4 solution is added to the solution to oxidize the Fe2+ ions to Fe3+. Calculate the molar concentrations of Fe2+ and Fe3+ in the original solution.
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