Redox titrations can be used to determine the concentration of a reagent. Fe2+ and C2O42- are reducing agents whilst MnO4- is an oxidising agent.The titration of Fe2+ with MnO4-:MnO4-(aq) + 8H+ + 5Fe2+(aq) → Mn2+(aq) + 4H2O (l) + 5Fe3+(aq)Titration of C2O42- with MnO4-:2MnO4-(aq) + 16H+(aq) + 5C2O42-(aq) → 2Mn2+(aq) + 8H2O + 10CO2(g)