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7
Standard Reduction Potentials
The E values corresponding to reduction half-reactions with all solutes at 1M and all gases at 1 atm.
Cu2+ + 2e    Cu           E = 0.34 V vs. SHE
SO42 + 4H+ + 2e    H2SO3 + H2O    
      E = 0.20 V vs. SHE