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vanadiumstudent - 9/7/2009 C118 Laboratory Two Oxidation...

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9/7/2009 1 C118 Laboratory Two Oxidation States of Vanadium Report is worksheet forma 25 pts Report is worksheet format-25 pts. VO 2+ VO 2 + What is the oxidation state of vanadium in VO 2+ ? In VO 2 + ? Goal: To determine the standard potential (E°) for the reaction VO 2 + (aq) VO +2 (aq) E° = ? The electrochemistry: Balance the half cell in acidic conditions Is this half reaction a reduction (A) or an oxidation (B)?
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9/7/2009 2 Conditions for Spontaneous Redox Reaction Demonstration: Beaker 1: Cu 2+ (aq) + Zn (s) (aq) Zn (s) Beaker 2: Zn 2+ (aq) + Cu (s) Rd b t i Record observations: Write the products of the reaction in beaker 1 and 2. Conditions for Spontaneous Redox Reaction Standard Reduction Potentials: Cu 2+ (aq) + 2e- Cu (s) E° = +0.337 V Zn 2+ (aq) + 2e- Zn (s) E° = -0.763 V Calculate E° for the reactions in beaker 1 and 2: Beaker 1: rxn Cu 2+ (aq) + 2e- Cu (s) E° = +0.337 V Zn (s) Zn 2+ (aq) + 2e- E° = +0.763 V Cu 2+ (aq) + Zn (s) Cu (s) + Zn 2+ (aq) E° = +1.100 V Beaker 2: no rxn 2+ Zn (aq) + 2e- Zn (s) E° = -0.763 V Cu (s) Cu 2+ (aq) + 2e- E° = -0.337 V Zn 2+ (aq) + Cu (s) Zn (s) + Cu 2+ (aq) E° = -1.100 V What must be true for a reaction to be spontaneous?
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This note was uploaded on 07/02/2011 for the course CHEM-C 118 taught by Professor Flood during the Spring '10 term at Indiana.

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vanadiumstudent - 9/7/2009 C118 Laboratory Two Oxidation...

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