PurposeThe purpose of this lab was to see firsthand the diffusion of a substance across a selectively permeable membrane. Diffusion is the movement of molecules from an area of ​​high concentration to an area of ​​lower concentration until both concentrations are equal, or, as you might more professionally call it, equilibrium. This concept is what we are studying in depth currently in biology class. Procedure We separated into groups of two each, making sure we had the following lab materials: graduated cylinder, plastic bag, starch solution, cable tie, 500 -ml beaker, iodine solution, a pair of glasses, and an apron (for the person handling the iodine solution). Next we will put the starch solution, the right amount of course, into the plastic bag and fix it by rotating it. necktie. Next, one person in our group would put on protective gear (goggles and apron) to carefully handle the iodine solution. We will pour 250 ml of water into a 500 ml glass, followed by 15 drops of iodine. After that we will put the s...