1. A selectively permeable membrane separates the solutions in the arms of a U-tube. The membrane is permeable to water and substance B, but not substance A. 60 g of substance A and 40 g of substance B was added to side 1 of the tube. 40 g of substance A and 60 g of substance B was added to side 2 of the tube. What would happen to the amount of substance A, substance B, and water on each side of the tube as it reaches equilibrium?

3. Flask X contains a solution that is 0.5% NaCl.
The cell membrane of red blood cells is permeable to water, but not to sodium chloride, NaCl. Suppose you have three (3) flasks:
Flask X contains a solution that is 0.5% NaCl.
Flask Y contains a solution that is 0.9% NaCl
Flask Z contains a solution that is 1.5% NaCl.
To each flask, you add red blood cells, which contain a solution that is 0.9% NaCl.
1. Predict what will happen to the red blood cells in flask X.
Solution in the flask:
Solution in the cell:
What would happen to the cell?