Osmosis/Diffusion Practice Problems
This cell containing an aqueous solution enclosed in a selectively permeable membrane has just been immersed in this box containing a different solution. The membrane is permeable to water and glucose, but not to the sucrose.
- Initially, are these solutions isotonic to each other? If not which is hypotonic and which is hypertonic?
- At the very beginning (as soon as the cell is immersed in the box) will osmosis occur? If so, in which direction?
- After a period of time, the system (the cell and the box) will reach an equilibrium. What will have happened to the concentration of solutes and to the water?
The beaker below has a solution of protein on either side of a selectively permeable membrane. The membrane is permeable to water but not to the protein.
- Are these solutions isotonic to each other? If not, which one is hypertonic, which one is hypotonic?
- Will there be osmosis? If so, into which side of the beaker will the water diffuse?
- Will the protein diffuse across the membrane? Why or why not?
What if instead of the protein you put 1,000 molecules of NaCl in side A of the beaker and 1,000 molecules of glucose in side B of the beaker as seen below. The membrane is permeable to water, but not to the NaCl or the glucose.
- Will there be osmosis in this system? If so, which direction will the water diffuse?
Suppose that the membrane is permeable to the NaCl but not the glucose.
- What will happen in the system by the time it reaches equilibrium?