ABSTRACT: This experiment was to observe diffusion happening within the cells, and to help understand the sizes of molecules and how the chemical reactions take place. Therefore, the experiment was conducted using glucose and starch solution inside the dialysis tube. The starch and glucose that was put inside the dialysis tube help identify which of the two will reacted with potassium iodide inside the breaker, as the latter passed from the beaker into the tube, the glucose/starch solution's change of color showed that the potassium iodide was small enough that it able to pass through from the solution and into the bag. After the Benedict test, glucose from the bag was also founded small enough that it can exit from the bag and into and solution. In the end, glucose and potassium iodide was the only two that is capable to move freely in and out within the bag, while starch molecules was too big so it got contain inside.
Introduction: …show more content…
In the presence of a concentration or electrochemical gradient, diffusion results in the net movement of a substance from a region where it is more concentrated to a region where it is less concentrated. Membranes allow the diffusion by letting certain molecules pass through it. Small pores in the semi (selectively) permeable membranes, which flow only towards one way, allow the process of osmosis to continue. These pores let only tiny molecules to go through them. One example might be the dialysis tubing in which a membrane made of a regenerated cellulose fibers formed into a flat tube. If two solutions containing dissolved substances of different molecular weights are separated by this membrane, some substances may readily pass through the pores of the membrane, but other may be excluded. The purpose of this is to test the three solution glucose, I2KI, starch, to see how they interact, and move within the permeable