7. Given the standard reduction potential for the following twohalf-cell reactions (in the presence of 1.00 M HCl):
Fe3+ + e <==> Fe2+, E0 = + 0.68 V
AsO4 - + 2H+ + 2e <==> AsO3 - + H2O, Eo = +0.559 V.
Please calculate the system potential at the equivalence pointwhen Fe3+ was used to titrate AsO3 - in the presence of 1.00 MHCl.
Answer: 0.60 V
