FUNDAMENTAL OXIDATION-REDUCTION EQUATION 



31 



of the activities of the various components. If concentrations are used, 

 equation 12 becomes: 



& 



£.-^,„M,_«Z',„^- 



nF [Oa:"+] nF yo,n^ 



brackets indicating concentrations. 



ki 



(13) 



20 40 60 80 100 



PER CENT OXIDATION 



RT \0x\ 



Fig. 1. Hypothetical oxidation-reduction curves. 



It is commonly assumed that the activity coefficients of oxidant and 

 reductant are equal, .so that the last term of equation 13 becomes zero and: 



