Two solutions a and b are separated by a membrane, which is permeable to water but not salts. solution a is a 2% nacl solution, while solution b is a 3% nacl solution. which will occur?

Water of solution A will go through membrane until solution B.

Explanation:

That phenomenon occurs by mass transfer.

Mass transfer is the movement from a location to another that occurs when you have mass gradient. In a membrane with different concentration solutions the system will try to equal both concentrations.

In the problem, Solution B is more concentrated than A. Thus, water will transport from solution A to solution B increasing concentration of A and decreasing concentration of B until the system stay in equilibrium.

I hope ot helps!