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Homework Help: Membrane potential

  1. Nov 17, 2007 #1
    1. The problem statement, all variables and given/known data

    a biological cell is immersed in a 50mM solution of NaCl at 37C. the cell's membrane is permeable only to Na+ ions. When the system reaches equilibrium, a potential diff of 54.9mV is measured between the inside and the outside of the cell where the inside has the higher( more positive potential.

    Calculate [Na+] inside the cell, assuming the amount of Na+ ions transferred is negligible compared to the total amoiunt of Na+ ions in the solution.

    Can anyone tell me where to start?
  2. jcsd
  3. Nov 22, 2007 #2


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    Staff Emeritus
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    Do you know what a concentration cell is?
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