A glass of distilled water is divided in two halves by an impermeable membrane.

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A glass of distilled water is divided in two halves by an impermeable membrane. Salt (NaCl) is dissolved in the left half, resulting in a concentration of 150 mM. Now, the membrane is suddenly made permeable to Na. What is the voltage across the membrane immediately after the channels open? Describe what happens as the solution reaches equilibrium. Why is an electrical field generated? What would the potential across the membrane be if, starting from initial conditions with 150 mM NaCl in the left half, the membrane was made permeable to K+ (potassium) but not Na+ or Cl-?

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