Ap Biology Lab: Osmosis And Diffusion

OSMOSIS AND DIFFUSION
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By:
Date: 05/25/09
Period: 1
Problems:

1. How will solutions of distilled water and 15% NaCl alter Plasmolysis in plant cells and how can this be compared to environmental problems such as salt water intrusion?
      How is diffusion represented by using a Dialysis bag, a glucose   solution, and potassium iodine?

        How does the Molarities of the sucrose solution affect osmosis,   and water potential?     Diffusion is the moment of molecules from a place where they are in high concentration to where they are in low concentration. Osmosis is a particular type of diffusion; it’s the movement of water molecules. So, for diffusion you could say when you cook something, you can smell it throughout the house; this is because the particles have spread out. For osmosis you could say if a potato is left in water it swells up because the potato has little concentration of water (lots of starch) so some of the water molecules enter in the potato.
Osmosis occurs when two solutions of different concentration are separated by a semi permeable membrane which is permeable to the smaller solvent molecules but not to the larger solute molecules, then the solvent will be likely to diffuse across the membrane from the less concentrated to the more concentrated solution. Osmosis is really important in biological processes where the solvent is water. The transportation of water and other molecules across biological membranes is essential to many processes in living organisms. The energy which drives the process is usually discussed in terms of osmotic pressure.
Hypothesis:
      If the potato cylinders are placed in a water solution, then   the water potential shall rise.    
2. During the lab, the placement of the potassium iodine solution will evenly diffuse into the dialysis bag, at a point creating an isotonic solution, and reacting with the sucrose solution. If this occurs, then the reaction will cause a...