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Lecture 10 - Redox Titrations

Redox Titrations -the oxidation/reduction reaction between analyte and titrant -titrants are commonly oxidizing agents, although reducing titrants can be used -the equivalence point is based upon: Aox + Bred ! Ared + Box Rx n goes to completion after each addition of titrant Potentiometric Titration: Titration reaction: Ce4+ + Fe2+ ! Ce3+ + Fe3+ (1) Reference half-reaction: 2Hg(l) + 2Cl- ! Hg2Cl2(s) + 2e- At the Pt indicator electrode (Indicator half-reaction) Fe3 + e- !Fe2+ E0 = V (2) Ce4+ + e- !

Redox indicators a. specific indicators – react with one of the participants in the titration to produce a color, e.g. thiocyanate b. Oxidation-reduction indicators- respond to the potential of the system rather than to the appearance or disappearance of some species during the course of the titration, e.g. methylene blue

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