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Unformatted text preview: Lectures: Classical Methods of Chemical Analysis 1 Redox Titrations Chapter 16 To be covered: 1) Measurement Devices Problems: 4,7,10,13 2) Potential During Titration 4) Redox Indicators 5) Iodimetry, Iodometry Methods of Redox Titrations Redox titrations use a sensing electrode for one of the species present in the reaction. The electrode reaction is not the same as the reaction in solution. Lectures: Classical Methods of Chemical Analysis 2 Redox Titration and Potential Ce 4+ + Fe 2+ Ce 3+ + Fe 3+ E 50 ml of 0.1 M Fe 2+ using 0.1M Ce 4+ f =0 1.2 1.0 1.6 1.4 0< f <1 f =1 f >1 VOLUME REACTANT ml 0.8 20 40 60 80 100 f=mole fraction of Ce 4+ added compared to moles Fe 2+ Redox Titrations The redox reaction can be considered similar to a strong acid base reaction except potential is measured: Ox1 + Red2 Red1 + Ox2 there are four governing equations in the titration related to the different fraction of reactant added....
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