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CH3041
pE OF THE SYSTEM
• Ox1 +
Red2 ® Red1 + Ox2
Eo = EoReduction - EoOxidation
Eo = EoReduction - EoOxidation
• In natural systems it is unlikely that
the
concentrations of both redox couples will
be similar.
concentrations of both redox couples will
be similar.
• If [Ox1] [Red1] >> [Ox2] [Red2] then the free concentrations of [Ox1] and [Red1] will not be changed
significantly by the redox rxn.
• The equilibrium
activity pE is effectivly
just that of the dominant redox couple 1 .
just that of the dominant redox couple 1 .
• In natural
waters the dominant redox couple sets the pE
of the system.
