L.E.O. G.E.R. - New Providence School District · 1 Electrochemistry L.E.O. G.E.R. Cu Cu2+ + 2e...

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1 Electrochemistry L.E.O. G.E.R. Cu Cu 2+ + 2e Fe 3+ +e Fe 2+ Al + CuCl 2 Al Cl 3 + Cu Fe Cl 3 +H 2 S Fe Cl 2 + S + HCl Cr 2 O 7 2 (aq) + Cl (aq) Cr 3+ (aq) + Cl 2(g) (acidic) MnO 4 - + SO 3 2- → Mn 2+ + SO 4 2- (acidic) Cr + Cl O 4 - → Cr O 2 - + Cl O 3 - (basic) H 2 O H + "OTHER" O H e OH

Transcript

Electrochemistry

L.E.O.

G.E.R.

Cu Cu2+ + 2e

Fe3+ + e Fe2+

Al + CuCl2 AlCl3 + Cu

FeCl3 + H2S FeCl2 + S + HCl

Cr2O72(aq)+ Cl(aq) Cr3+(aq)+ Cl2(g) (acidic)

MnO4− + SO32− → Mn2+ + SO42− (acidic)

Cr + ClO4− → CrO2− + ClO3− (basic)

H2O H+

"OTHER" O H e OH

Page 2: L.E.O. G.E.R. - New Providence School District · 1 Electrochemistry L.E.O. G.E.R. Cu Cu2+ + 2e Fe3+ + e Fe2+ Al + CuCl2 AlCl3 + Cu FeCl3 + H2S FeCl2 + S + HCl Cr2O72(aq)+ Cl(aq)

Standard Reduction Potentials

Galvanic Cell

Why 1.10 V? Zn(s)|Zn2+(aq) ||Cu2+(aq) |Cu(s)anode cathode

Ni Al

Ni2+ Al3+

Fe Ag

Fe Au

Au1+Fe3+

Ni Cu

Cu2+Ni2+

Fe3+ Ag+

http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/galvan5.swf

Page 3: L.E.O. G.E.R. - New Providence School District · 1 Electrochemistry L.E.O. G.E.R. Cu Cu2+ + 2e Fe3+ + e Fe2+ Al + CuCl2 AlCl3 + Cu FeCl3 + H2S FeCl2 + S + HCl Cr2O72(aq)+ Cl(aq)

F = 96,485

ΔGo = n F Eo

Spontaneity

Cmol

Eo = +Eo =

# of e stransferred

Page 4: L.E.O. G.E.R. - New Providence School District · 1 Electrochemistry L.E.O. G.E.R. Cu Cu2+ + 2e Fe3+ + e Fe2+ Al + CuCl2 AlCl3 + Cu FeCl3 + H2S FeCl2 + S + HCl Cr2O72(aq)+ Cl(aq)

The Nerst Equation

= 0.0592n log Q

@ 25oC

EoEcell

Q = K at equilibrium

Ecell = 0therefore

MnAl

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L.E.O. G.E.R. - New Providence School District · 1 Electrochemistry L.E.O. G.E.R. Cu Cu2+ + 2e...

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