Lecture 253/27/06 Bottle and Can drive today 11-3 Hagan Info Booth Seminar today at 4 pm.

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Presentation transcript:

Lecture 253/27/06 Bottle and Can drive today 11-3 Hagan Info Booth Seminar today at 4 pm

Displacement reactions Some metals react with acids to produce salts and H 2 (g) Balance the following displacement reaction: Zn (s) + HBr (aq)  ZnBr 2 (aq) + H 2 (g)

voltaic or galvanic cell electrolytic cell Electrochemical cells

Requires Electrodes Salt bridge External circuit

Anode: Cathode: Net reaction: Electrochemical cell notation:

Electromotive force (emf) Cell potential Cell voltage

All other potentials determined from the SHE Zn (s)  Zn 2+ (aq, 1 M) + 2e - E° ox = ? 2 H 3 O + (aq, 1 M) + 2e -  H 2 (g, 1 atm) + 2 H 2 O E° red = 0 V__ Zn (s) + 2 H 3 O +  Zn 2+ + H H 2 O E° cell = V

For any reaction: E° ox = - E° red

Standard Reduction Potentials (25° C) E° F 2 (g) + 2e - ↔ 2F Au e - ↔ Au (s)+1.50 Cl 2 (g) + 2e- ↔ 2 Cl O 2 (g) + 4 H + + 4e - ↔ 2 H 2 O+1.23 Hg e - ↔ Hg (l)+0.85 Ag + + e - ↔ Ag (s)+0.80 Fe 3+ + e - ↔ Fe Cu e - ↔ Cu (s)+0.34 Sn e - ↔ Sn H e - ↔ H 2 (g) 0.00 Pb e - ↔ Pb (s)-0.13 Sn e - ↔ Sn (s)-0.14 Ni e - ↔ Ni (s)-0.26 Zn e - ↔ Zn (s)-0.76 Cr e - ↔ Cr (s)-0.91 Mg e - ↔ Mg (s)-2.37 Na + + e - ↔ Na (s)-2.71 Ca e - ↔ Ca (s)-2.87 Li + + e - ↔ Li (s)- 3.04