A solution contains both Fe2+ and Fe3+ ions. 25.0 ml of this solution required 45.0 ml of 0.01 M acidified permanganate

Question

A solution contains both Fe2+ and Fe3+ ions. 25.0 ml of this solution required 45.0 ml of 0.01 M acidified permanganate solution. In a separate analysis 25.0 ml of the original solution is treated with Zn powder which reduces Fe3+ into Fe2+ and it then required 3.76 ml of 0.2 M acidified KMnO4 solution to reach the end point. Determine the molarity of Fe3+ is the original solution.

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