The magnitude of an electrical difference that exists across the membrane can be determined by: (A) Gibbs-Donnan equation, (B) Henderson-Hasselbalch equation, (C) Nernst equation, (D) Fick's law
Answer is C. In electrochemistry, the Nernst equation is an equation that relates the reduction potential of an electrochemical reaction (half-cell or full cell reaction) to the standard electrode potential, temperature, and activities (often approximated by concentrations) of the chemical species undergoing reduction and oxidation Ref: guyton and hall textbook of medical physiology 12 edition page number:58,59,60