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ron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation. Cr2O72- + 6 Fe2+ + 14 H+ 2 Cr3+ + 6 Fe3+ + 7 H2O If it takes 30.0 mL of 0.0250 M K2Cr2O7 to titrate 20.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+?