March 30, 2009 - March 30, 2009 electrode metal ion with...

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Unformatted text preview: March 30, 2009 electrode metal ion with higher charge it will receive electron(s) Fe 3+ + 1e Fe 2+ 0.77 Fe 2+ (lower charge) is like metal Fe 2+ Non metals See from table Fe 3+ + e Fe 2+ + e E = 0.77 Zn 2+ + 2e Zn E = -0.76 Fe 2+ + Zn 2+ Fe 3+ + Zn (unbalanced) E = E zn E Fe = -0.76 (+0.77) = -1.53V If know Zn position just take Fe from table and insert Ag + ion can be very poisonous Electrode of second kind For biological systems Cl 2 also poisonous but Cl- is not Ag|AgCl electrode really Cl- electrode +V electrode 1 Ag + Cl- |Ag AgCl insoluble on surface Ag + moves to Ag electrode, receives e and becomes Ag leaving a Cl- behind Cl- moves off surface into solution Ag never leaves the electrode Other electrode Ag | Ag + Cl- e separates from Ag metal to move in wire and creates Ag + ion near surface Cl- ion moves to electrode AgCl precipitate on surface Net effect...
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This note was uploaded on 02/26/2012 for the course CHEM 108 taught by Professor Dr.brennan during the Spring '09 term at Binghamton University.

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March 30, 2009 - March 30, 2009 electrode metal ion with...

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