87. 7 Thermodynamics of reversible cell 7.7.2 Nernst equation and standard EMF of cell 7.7.3. Standard electromotive forces Theoretical deduction of Nernst equation For a general electrochemical reaction: Ee equals e when the activity of any cC+d-G+hh ya d cap For cell ag Van't Orff equation △G=△G+RTln24 Pb(s)-Pbo(s)oH(cHgo(s)-Hg( △G.=-HFE rite out the cell reaction and nernst nFE equation RT E=EFor a general electrochemical reaction: cC + dD = gG + hH G H C D g h a c d a a K a a = Van’t Horff equation G H r m r m C D Δ Δ ln g h c d a a G G RT a a = + Δr m G nFE = − Δr m G nFE = − G H C D ln r h c d RT a a E E nF a a = − Theoretical deduction of Nernst Equation: 7.7.2 Nernst equation and standard EMF of cell EӨ equals E when the activity of any chemical species is unit. For cell: Pb(s)-PbO(s)|OH– (c)|HgO(s)-Hg(l) Write out the cell reaction and Nernst equation. 7.7.3. Standard electromotive forces §7.7 Thermodynamics of reversible cell