Chapter 5, Problem 126RQ

A mixture is made by combining $\text{325 mL of 0}\text{.0200 }M{\text{ Na}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ with $\text{425 mL of 0}\text{.060 }M\text{ Fe}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}$. Initially, the ${\text{H}}^{\text{+}}$ concentration in the mixture is 0.400 M. Dichromate ion oxidizes ${\text{Fe}}^{\text{2+}}{\text{to Fe}}^{\text{3+}}$ and is reduced to ${\text{Cr}}^{\text{3+}}$. After the reaction in the mixture has ceased, how many milliliters of 0.0100 M NaOH will be required to neutralize the remaining ${\text{H}}^{\text{+}}$ ?