19.4 Standard Cell Potentials aka emf or Voltage
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How to Calculate Standard Cell Potential (Eocell)
ε° = ε°cat - ε°an OR ε° = ε°red + ε°ox
Zn2+ + Co → Zn + Co2+ ε° =
2Cr3+ + 3Cu → 2Cr + 3Cu2+ ε° =
What is the balanced reaction for the galvanic cell composed of Mn2+/ Mn and Fe2+/ Fe half cells and calculate its standard cell potential?
| STANDARD HYDROGEN ELECTRODE (SHE) | |
|---|---|
| 2H+ + 2e- → H2 | 0.00v |
| REDUCTION POTENTIALS | |
|---|---|
| Al3+ + 3e- → Al | -1.66V |
| Mn2+ + 2e- → Mn | -1.18V |
| Zn2+ + 2e- → Zn | -0.76V |
| Cr3+ + 3e- → Cr | -0.74V |
| Fe2+ + 2e- → Fe | -0.44V |
| Co2+ + 2e- → Co | -0.28V |
| Ni2+ + 2e- → Ni | -0.25V |
| 2H+ + 2e- → H2 | 0V |
| Cu2+ + 2e- → Cu | +0.34V |
| Ag+ 1e- → Ag | +0.80V |
| Br2 + 2e- → 2Br- | +1.07V |
Reduction Potentials
a) What is the strongest oxidizing agent?
b) What is the strongest reducing agent?
c) Which pairs will react spontaneously under standard conditions?