Both `Cr_(2)O_(7)^(2-)` and `MnO_(4)^(-)` solutions can be used to titrate `Fe^(2+)` in acidic medium. Suppose you have (0.1 M solution of each). For a given sample of `Fe^(2+)` solution. If a given titration requires -7.5 mL of 0.1 m `Cr_(2)O_(7)^(2-)` o solution, how many mL of 0.1 M `MnO_(4)`, would have been if it had been used instead. 

Explanation