A 25.0 mL sample containing Fe3+ was treated with 10.00 mL of EDTA 0.0367 mol / L to complex all the iron and leave an excess of EDTA in solution. To the excess of EDTA was added 2.47 mL of Mg2+ 0.0461 mol / L which guaranteed all EDTA consumption. What was the concentration of Fe3+ in the original solution?

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