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