Evaluation of Redox Titrimetry
The scale of operations, accuracy, precision, sensitivity, time, and cost of methods involving redox titrations are similar to those described earlier for acid–base and complexometric titrimetric methods. As with acid–base titrations, redox titrations can be extended to the analysis of mix- tures if there is a significant difference in the ease with which the analytes can be oxidized or reduced. Figure 9.40 shows an example of the titration curve for a mixture of Fe2+ and Sn2+, using Ce4+ as the titrant. The titration of a mixture of analytes whose standard-state potentials or formal potentials differ by at least 200 mV will result in a separate equivalence point for each analyte.