The Nernst Equation RT TI ZF LXIB Where Ex equilibrium potential of X R ideal gas constant T absolute temperature charge number of the ion F Faraday's number Xl natural logarithm of concentration ration [X lOof X+ on the two sides of the membraneThe Nernst Equation B A X A B X X zF RT E E E [ ] [ ] ln + + = − = − Where EX equilibrium potential of X+ R ideal gas constant T absolute temperature z charge number of the ion F Faraday’s number natural logarithm of concentration ration of X+ B on the two sides of the membrane A X X [ ] [ ] ln + +