Compartments A and B are separated by a membrane that is permeable to K+ but not to Na+ or Cl-. At time zero, a solution of KCl is poured into compartment A and an equally concentrated solution of NaCl is poured into compartment B. Which would be true once equilibrium is reached?
A. Diffusion of K+ from A to B will be greater than the diffusion of K+ from B to A.
B. The electrical potential difference and diffusion potential due to the concentration gradient for K+ will be equal in magnitude and opposite in direction.
C. The concentration of Cl- will be higher in B than it was at time zero.
D. The concentration of Na+ in A will be higher than it was at time zero.
E. There will be a potential difference across the membrane, with side B negative relative to side A.
Answer: B
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