A solution of iron(II) sulfate was prepared by dissolving 10.00 g of FeSO4•7H2O (FW = 277.9) in water and diluting up to a total volume of 250 mL. The solution was left to stand, exposed to air, and some of the iron(II) ions became oxidized to ron(III) ions. A 25.0 mL sample of this partially oxidized solution required 23.70 mL of 0.0100 M potassium dichromate K2Cr2O7 solution for complete reaction in the presence of dilute sulfuric acid. Calculate the percentage of iron(II) ions that had been oxidized by the air.

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