Equilibrium potential for an ion is calculated using
Gibbs Donnan equation
Goldman equation
Nernst equation
Henderson Hesselbach equation
Equilibrium potential for an ion is calculated by Nernst equation. the Nernst potential corre- sponding to this ratio is -94 millivolts because the loga- rithm of 35 is 1.54, and this multiplied by -61 millivolts is -94 millivolts. Therefore, if potassium ions were the only factor causing the resting potential, the resting potential inside the fiber would be equal to -94 millivolts, as shown in the figure. (REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GEETHA N 2 EDITION, 28)
General physiology