Help with Diffusion and Membrane Potential (electrical gradient)

Hey guys I can't seem to figure this one out. A little help would be greatly appreciated it. Thanks!


1. Assume that a membrane permeable to sodium but not to chloride separates two solutions. Concentration of sodium chloride on side 1 of the membrane is much higher than on side 2. Which of the following would occur? Why?

- Na+ will move until its concentration gradient is dissipated.

- Cl- will move down its concentration gradient from side 1 to side 2.

- A membrane potential, negative, on side 1 will develop

- A membrane potential, positive, on side two will develop.

Support your answer with explanations (2)

I basically think that a positive membrane potential will develop on side 2 because the sodium ions, which are positive will flow into it. I also think the Na+ (sodium ions) will move until its concentration gradient is dissipated but I am not sure why.