Osmosis And Diffusion Lab Report

Within the lab of observing passive transport, it had been apparent that only two different types of transport had been used. Both diffusion and osmosis are involved in the movement of substances from an area of high concentration to an area of low concentration. They will both continue to happen until an equilibrium is reached, at which time there will be no net movement of substances. Diffusion does not require a membrane to occur and it involves a variety of different molecules.. Osmosis, on the other hand, involves the movement of water molecules from a region where they are in high concentration (hypotonic solution) to a region where they are in lower concentration (hypertonic solution) across a semipermeable membrane.

The iodine solution

Then it is shown how the membrane was selectively permeable when the small water and iodine molecules are able to pass through into the dialysis tubing. Once it had turned into a bluish black it was apparent that the cell membrane was selectively permeable because of the color change. The data that was recorded throughout the experiment provide further evidence of this but also overall give a clear picture of what had been completed within the lab. When the dialysis tubing color changed it was apparent that the iodine and water solution had went inside. This also was a clear indicator because the original coloring inside of the dialysis tubing was clear/white because of the starch and glucose inside of it. On the other hand the data also shows how the glucose was able to cross the semipermeable membrane into the iodine/water solution because it tested positive on the glucose test strip. This was tested by placing the glucose test strip into the water/iodine solution and the indicator was if the color changed from teal to a green-brown color. Lastly was to see if the iodine solution had changed, and it was clearly shown through the data that it was not affected, except for it leaving the cup into the dialysis tubing. The color it had originally started off with was amber, and it remained that color after the dialysis tubing was placed in the