The purpose of this lab was to observe the diffusion of a substance across a semi-permeable membrane. Diffusion is a process by which molecules move from an area to a higher to lower concentration. Also, the lab had an example of osmosis. One prediction that was made was that the concentration (iodine solution) would go through the plastic baggie and change the color of the starch inside of the baggie. The beaker with the concentration in it was more hypertonic than the baggie, which was more hypotonic. Hypertonic means that it is a solution with a greater concentration than another. Hypotonic is the opposite of hypertonic.
This procedure was just like a cell. When the starch and the concentration met, the water and concentration were like nutrients to the cell. The starch is the organelles, and the baggie could act as a cell wall. After we put the baggie filled with starch in the concentration, we had to wait fifteen minutes so we could see how the concentration affected the baggie. In the end of the fifteen minutes, the baggie turned purple, when it was originally white.
This lab had a lot of connections to everyday life. My first example is if you put a juice mix such as Kool-Aid into a glass of water. This is just like when the iodine came in contact with the starch. My second example is a balloon filled with air. Another example is a fire place when it is filled with fire. My last example is when you bake cookies and the smell goes into the air, this is like the lab because the smell is affecting everyone.
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