The Lab of Diffusion - Class Response

Today in class, we did a lab to learn about the process of diffusion. For the experiment, the baggie of corn starch represented a semi permeable membrane and the iodine substance represented an indicator. My table group observed for about fifteen minutes that the iodine's purpose was to change the color of the corn starch during its direct contact with it. The iodine was significant to the lab because without it, there would be no change in any substance and the corn starch wouldn't have reacted to the diffusion which was taking place. Diffusion occurred because molecules from the diluted iodine water  had no space to move around and they were able to identify the less concentrated source of corn starch in the course of the lab. This form of diffusion was osmosis because the water molecules were travelling throughout the permeable membrane which was the baggie of corn starch. The goal of the lab was for the corn starch to successfully turn purple but due to the baggie being too well-made, the corn starch instead turned  into a light yellow color. Even though the lab wasn't successful, I thought it was cool how the chemicals were reacting to each other. I was able to understand how the iodine's contact with the corn starch impacted the spread of molecules. Although, it would be interesting to see how corn starch could turn from clear/white to purple.