This laboratory exercise is presented as an alternative to the traditional AP Diffusion and Osmosis lab. I always felt the "official" lab skimped in some spots (like the analysis questions) but went into too much abstract discussion of water potential and lost the students in Greek letter formulas. So here is an adaptation where the explanations have been clarified and the summary questions have been expanded. I have broken the lab up into 4 parts and I have students complete ALL parts sequentially.

• Lab A: Diffusion Through a Membrane
• Lab B: Osmosis Through a Membrane
• Lab C: Osmosis in a Plant Cell -- Plant Cell Plasmolysis
• Lab D: Osmosis Challenges -- students have to figure out how to solve these challenges using the skills they just learned.

Teachers please note: I have not included "Exercise 1B" (the dialysis tubing cells in the different sucrose solutions) from the AP Lab in this adaptation because I do that as an inquiry lab after the students attain the skills through this lab. (I put out the 6 beakers of solutions -- 0M, 0.2M, 0.4M, 0.6M, 0.8M, 1.0M sucrose -- but make believe they have been mixed up and mislabeled, then challenge the students to devise a method to determine the relative molarity of the beakers.) It is part of Lab D in this list.