I am doing an experiment on osmosis. I take some dialysis tubing (a semi-permeable membrane) and fill it with a 50% sugar solution. Sugar molecules are very big, and cannot pass through the membrane. If I want to make the cell gain weight, which beaker should I place it into?
a. beaker of 70% sugar solution
b. beaker of water
c. beaker of 90% sugar solution
d. beaker of any type of sugar solution
e. None of these conditions would cause the cell to gain weight
What you want to do is put the dialysis tubing in a hypotonic situation, where there is more solutes in the dialysis tubing than in the outside environment in the beaker. So this means that options a, c, and d will not work. You want to have the 50% solution in the tubing and solely water in the beaker, so then the water moves from outside the tubing to inside the tubing. This will result in the “cell” weighing more.