CH204 Expt 6 - part 2 of expt 5

CH204 Expt 6 - part 2 of expt 5 - Last week: Synthesis of...

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1 1 Last week: Synthesis of K 3 [Fe(C 2 O 4 ) 3 ]•3H 2 O This week and the next two weeks: Analysis of the complex iron compound. This week oxidation-reduction (Redox) chemistry. 2 Oxidation – Reduction reactions are driven by the change of electrons. t OIL RIG t Oil = o xidation i s l oss of electrons t Rig = r eduction i s g ain of electrons t Redox occurs between reactants and the products are the result after the change of electrons have occurred. 3 t Oxidation states change as the reactant gains or loses electrons during the redox reaction. 0 0 +1 ±1 2 Na (s) + Cl 2 (g) 2 NaCl (s) Half reactions: 2 Na (s) 2 Na + + 2 e ± (oxidation; reducing agent) Cl 2 (g) + 2 e ± 2 Cl ± (reduction; oxidizing agent) 4 t 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
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CH204 Expt 6 - part 2 of expt 5 - Last week: Synthesis of...

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