cell potentials at standard conditions
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Cell Potentials at Standard Conditions. Revisiting E cell. Standard Reduction Potentials. Reduction potentials for many electrodes have been measured and tabulated. Standard Hydrogen Electrode. Their values are referenced to a s tandard h ydrogen e lectrode ( SHE ). - PowerPoint PPT PresentationTRANSCRIPT
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Cell Potentials at Standard Conditions
Revisiting Ecell
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Standard Reduction Potentials
Reduction potentials for
many electrodes have been
measured and tabulated.
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Standard Hydrogen Electrode• Their values are referenced to a standard hydrogen
electrode (SHE).• By definition, the reduction potential for hydrogen is
0 V: 2 H+ (aq, 1M) + 2 e− H2 (g, 1 atm)
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Standard Cell PotentialsThe cell potential at standard conditions can be found through this equation:
Ecell = Ered (cathode) − Ered (anode)
Because cell potential is based on the potential energy per unit of charge, it is an intensive property.
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Sample Exercise 20.5 p.841
Ecell = Ered (cathode) − Ered
(anode)
TREND ALERT!The more the , the greater the tendency for reduction under std conditions.
Ered
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Oxidizing and Reducing Agents
F2: Most + value, easily reduced, strongest oxidizing agent
Li: Most – value, easily oxidized, strongest reducing agent
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Oxidizing and Reducing Agents p. 843
• The strongest oxidizers have the most positive reduction potentials.
• The strongest reducers have the most negative reduction potentials.
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Oxidizing and Reducing Agents
The greater the difference between the two, the greater the voltage of the cell.
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Sample Exercise 20.8 p. 845
WEAKEST …………………………………STRONGEST
NO3- = + 0.96 V Ag+ = +0.80 V Cr2O7
-2 = +1.33 V
Ag+ NO3-
Cr2O7-2