Potassium dichromate can be used to conduct a potentiometric titration of iron II chloride in acidic medium. if 50.0 mL of 0.100 M FeCl2 in 1.00 M HClO4 is titrated with 0.0167 M K2Cr2O7, what would be the potential versus NHE after 10.0 mL, 30.mL, 40 mL and 60.0 mL of titrant have been added.
The balanced net ionic equation is 6Fe2+ + Cr2O72- + 14H+ goes to 6Fe3+ + 2Cr3+ + 7H2O