Practice question

Question

The equilibrium potential of a biological membrane for Na+ is 55 mV at 37 ⁰C. Concentration of Na+ inside the cell is 20 mM. Assuming the membrane is permeable to Na^+ only, the Na^+ concentration outside the membrane will be ______________ mM. (Faraday constant: 23062 cal.V-1.mol^-1, Gas constant: 1.98 cal.mol-1.K^-1)