ECF concentration of 1C. is 150 meq/L
and ICF concentration of le is 5 meq/L.
What is the equilibrium potential for K+
is?
a) +60 mV
b) -60 mV
c) -90 mV
d) +90 mV
Correct Answer - C
Ans. ‘c’ i.e., -90 mV
Nernst Equation –
Can be used to find the cell potential at any moment in during a
reaction or at conditions other than standard-state.
E = cell potential (V) under specific conditions
E= cell potential at standard-state conditions
R = ideal gas constant = 8.314 J/mol-K
T = temperature (kelvin), which is generally 25C (298 K)
n = number of moles of electrons transferred in the balanced
equation
F = Faraday’s constant, the charge on a mole of electrons =
95,484.56 C/mol
lnQc = the natural log of the reaction quotient at the moment in time.
- 61 150
EK = log = 90 mV
+1 5