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Unformatted text preview: 1 Experiment 6 Synthesis und Analysis uff ein Magical Green Crystal Part Deux: Oxalate Content Analysis by Redox Titration Using a Vile Purple Fluid CH 204 Fall 2008 Dr. Brian Anderson But first Last veek: Synthesis of K x [ Fe y (C 2 O 4 ) x ] zH 2 O Coordinate covalent bonds and metal complex ions Calculating limiting reagent and theoretical yield This veek: Oxidation-Reduction (Redox) chemistry What is redox chemistry? Moving electrons between different atoms: Cu 2+ (aq) + Zn (s) Cu (s) + Zn 2+ (aq) Cu 2+ (aq) + 2 e Cu (s) Cu 2+ gains electrons. Cu 2+ is REDUCED. Zn (s) 2 e + Zn 2+ (aq) Zn (s) loses electrons. Zn (s) is OXIDIZED. 2 Our redox reaction We will use MnO 4 to oxidize the oxalate ligands surrounding the Fe 3+ . The carbon in the oxalate ions will be oxidized, und the oxalate will change from C 2 O 4 2 to CO 2 (g) . MnO 4 (aq) + C 2 O 4 2 (aq) CO 2 (g) + Mn 2+ (aq) Reduction Oxidation Hey! This reaction is not balanced! Carbon atoms in oxalate LOSE electrons Manganese atom in permanganate ion GAINS electrons Balancing redox reactions Separate the overall equation into two half-reactions . For each half-reaction: 1. Balance the main atom.1....
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