Using Standard Potentials, Eo

H2O2 /H2O +1.77

Cl2 /Cl- +1.36

O2 /H2O +1.23

• In which direction does the following reaction go? Cu(s) + 2 Ag+(aq) ? Cu2+(aq) + 2 Ag(s)

Hg2+ /Hg +0.86

Sn2+ /Sn -0.14

Al3+ /Al -1.66

Ag+ /Ag +0.80

Cu2+ / Cu +0.34

• See Table 21.1, App. J for Eo (red.)

• Which is the best oxidizing agent: O2, H2O2, or Cl2 ?

• Which is the best reducing agent: Sn, Hg, or Al ?

As written: Eo = (-0.34) + 0.80 = +0.43 V

reverse rxn: Eo = +0.34 + (-0.80) = -0.43 V

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