How do you find the number of ml needed to neutralize?

A mixture is made by combining 260 mL of 0.0200 M Na2Cr2O7 with 440 mL of 0.060 M Fe(NO3)2. Initially, the mixture contains 0.400 mol of the H+. Dichromate ion oxidizes Fe2+ to Fe3+ and is reduced to Cr3+ . After the reaction in the mixture has ceased, ___ milliliters of 0.0100 M NaOH will be required to neutralize the remaining H+.