In science class today, we conducted a diffusion lab. Diffusion is the process in which molecules spread from areas of high concentration to areas of low concentration. In this lab we first filled a baggie with a spoon of starch and some water. After tying the baggie, we added iodine to a beaker half-filled with water. Then, we dunked the baggie into the beaker and let it sit for fifteen minutes. After this time the starch and water inside the baggie was supposed to turn purple because iodine is an indicator. This part of the lab was called osmosis, when water molecules move across a selectively permeable membrane. Instead, our baggie was too thick and the water and iodine was unable to pass through it.
Picture: http://www.biologycorner.com/resources/diffusion04.jpg
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