Iron in the +2 oxidation state reacts with potassium dichromate to produce Fe3+ and Cr3+ according to the equation
6 Fe2+ + Cr2O72- + 14 H+? 6 Fe3+ + 2 Cr3+ + 7 H2O.
How many milliliters of 0.1848 M K2Cr2O7 will be required to titrate 250.0 mL of 0.122 M Fe2+?
(Fe = 55.847 g/mol, Cr = 51.9961 g/mol, H = 1.00794 g/mol, O = 15.9994 g/mol).