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Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation: Cr2O72−...

Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation:
Cr2O72− + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe3+ + 7H2O

If it takes  25.5 mL of 0.0250 M K2Cr2O7 to titrate 25.0 mL of a solution containing Fe2+, what is the molar concentration of Fe2+ in the original solution?

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