The electrical potential difference necessary for a single ion to be at equilibrium across a membrane is best described by the
At normal body temperature (37degC), the electrical difference that will balance a given concentration difference of univalent ions--such as Na+ ions--can be determined from the following formula, called the Nernst equation.Ref: Guyton; 13th edition; Chapter 4 Transpo of Substances Through Cell Membranes
Goldman equation
van't Hoff equation
Fick's law
Nernst equation
General physiology