A law that improves on this one is formed by summing permeability times concentration over ion species that are positive and 
A law that improves on this one is formed by summing permeability times concentration over ion species that are positive and outside, negative and inside, positive and inside, and negative and outside, then diving the sum of the first two terms by the sum of second two and taking a logarithm. This equation can be derived by considering that the reaction quotient for a system of Arrhenius conjugates is the exponential of a standard chemical potential; it is thus a one-species approximation to the Goldman-Hodgkin-Katz equation. This equation can also be derived by balancing partial current densities. This equation contains a constant, k T over q, that measures the deviation from standard potential. For 10 points, name this equation that computes reduction potentials for electrochemical cells and that is named for a German chemist.
A law that improves on this one is formed by summing permeability times concentration over ion species that are positive and outside, negative and inside, positive and inside, and negative and outside, then diving the sum of the first two terms by the sum of second two and taking a logarithm.
the {Nernst} equation