... Inorganic Electrochemistry Theory, Practice and Application Inorganic Electrochemistry Theory, Practice and Application P Zanello University of Siena, Italy ... n F ( E E O ' , EO'), AGO 1I - n.F.(E-Eo'),,,/'' ,,, -_ /-* -c* REACTION COORDINATE Figure 14 Free energy changes f o r a furaduicprocess (-) E = E"'; (- - -) E > Eo' 28 Chapter , , REACTION ... the curve of the reduction half-reaction and the slope of the oxidation half-reaction, simple trigonometric rules afford: x * n - F * (E-E"') (1 - X ) n F * ( E - E D / ) tan0 = tan4 = X X so...