For 10 points, name this equation which determines the equilibrium reduction or oxidation potential of a half-cell in an electrochemical cell.
A quantity not accounted for in this fundamental equation but considered in the Tafel equation is overpotential, and  assuming equilibrium yields an exponential form of this equation named for Butler and Volmer. The ionic flux carried by ionic species across a cell membrane is described in the Goldman-Hodgkin-Katz equation, which accurately describes electrodiffusion in this equation. It essentially states that potential is shifted by a term equal to RT over nF times the natural log of the reaction quotient. For 10 points, name this equation which determines the equilibrium reduction or oxidation potential of a half-cell in an electrochemical cell.
A quantity not accounted for in this fundamental equation but considered in the Tafel equation is overpotential, and  assuming equilibrium yields an exponential form of this equation named for Butler and Volmer.
Nernst equation [accept Butler-Volmer equation before “Butler”]