Osmosis and Diffusion Essay

The basic principles of Osmosis and scattering were tested and examined in this research laboratory. We examined the per centum attach of sens and molarity of different assiduitys of saccharose in the dialysis traction emerged in distilled pissing supply and the potato cores emerged in concentrations of saccharose. The data reinforces the principles of Osmosis and Diffusion, and in a biological context, we target simulate how water and particles move in and out of our make cells. IntroductionObjective1. Investigate the process of osmosis and airing in a model of a membrane system.2. Investigate the effect of solute concentration on water potential as it relates to living plant tissue. Background schoolingMolecules are in constant motion they tend to move from areas of full(prenominal) concentration, to areas of low concentration. This broad principle is divided into two categories diffusion and osmosis. Diffusion is the random movement of molecules from an area of highe r concentration to an area of spurn concentration. This is considered a passive form of transportation because it does not require both additional energy to transport the molecules. In the body, carbon dioxide and oxygen can diffuse across cell membranes.Osmosis is a special type of diffusion where water moves through a selectively leaky membrane from a region of higher water potential to a region of press down water potential. In our body, water diffuses across cell membranes through osmosis. wet potential is the measure of free energy of water in a solution and is shown with the use of the symbol . Water potential is reckoned by two factors osmotic potential () and pinch potential (p). Osmotic potential is dependent on the solute concentration, and pressure potential which is the energy that forms from exertion of pressure either positive or negative on a solution. The equality to find the sum of water potential is Water Potential = stuff Potential + Osmotic Potentialw = p + The purpose of this lab is to observe the physical effects of osmosis and diffusion and to determine if it actually constricts place. We job that, because molecules diffuse down a concentration gradient, the can of the dialysis tubes allowing increase, and we study that as the molarity increases, the percent of change in mass will also increase. HypothesisDiffusion and osmosis will occur until dynamic residuum is reached. As the saccharose concentration of the solution increases so will the mass. Materials practice session 11. 6 strips of dialysis tubing2. Distilled water 15-20ml3. 0.4 M sucrose 15-20ml4. 0.8 M sucrose 15-20ml5. 0.2 M sucrose 15-20ml6. 0.6 M sucrose 15-20ml7. 1.0 M sucrose 15-20ml8. 6 Beakers operation 21. 100ml of distilled water2. 100ml of 0.4 M sucrose3. 100ml of 0.8 M sucrose4. 100ml of 0.2 M sucrose5. 100ml of 0.6 M sucrose6. 100ml of 1.0 M sucrose7. 6 Beakers8. Potato slices (4 for each solution)9. Scale10. Plastic wrap11. ThermometerMethods elabor ate 11. Obtain 6 strips of dialysis tubing and tie a mil in one end of each. 2.Pour approximately 15-20ml of each of the spare-time activity solutions into separate lookers. 3. pull in ones horns most of the air from the bag and tie the baggie.4. dampen the baggie carefully in distilled water to remove any sucrose that may hand spilled and carefully blot.5. Record the mass of each baggie and record.6. Fill half dozen 250ml beakers 2/3 full with distilled water and place a bag in each of them. Make sure that you record which baggie is which.7. Let the bag sit for 20-30 minutes.8. After 20-30 minutes, remove baggies from the water, and carefully blot dry.9. Measure the mass of each baggie and record.Exercise 21. Pour 100ml of your assigned solution into a beaker. Slice a potato into 4 equal lengths about the name of French fries or tubes. 2. Determine the mass of the 4 potato cylinders together and record. 3. Place the cylinders into the beaker with your assigned solutions an d cover with plastic wrap. Leave overnight. 4. Remove the cylinders from the beakers and carefully dry them. Record the room temperature in Celsius. 5. Determine the mass of the 4 potato cylinders together and record.From these results, it can be concluded that the guessing is justified and correct. The data shows that the mass increased as the concentration of the sucrose solution increased. Osmosis is clearly being replicated in the physical form. Analysis transpose in mass depends on the concentration of sucrose within the dialysis bags. If the concentration of sucrose is greater inside the bag than outside, therefore water will move into the bag. If the concentration of sucrose is lower inside the bag than outside, then water will move out of the bag. These two things are this instant proportional. As the mass increases, so does the molarity. These are inversely proportional because whenever the sucrose molarity inside the bag is more(prenominal) concentrated, it will become more dilute and vise versa. The solutions will reach equilibrium somewhere betwixt the two concentrations.The hypothesis is accepted based on the data that was obtained because as the sucrose concentration increased so did the final mass of the solutions. ane possible writer of error could be the tightness of the string that tie off the dialysis tubing. If there was a leak or a fail in the dialysis tubing, all of the data would be off. Another possible source of error could be that the students did not pat dry the potato precedent well enough causing drops to be left on the electronic balance, tarring it incorrectly, causing all other data to be off slightly. frank mathematical errors always occur, so there is always room for plain algebraic mistakes in this section of the lab.ConclusionThe purpose of this lab was to let on the physical mechanism of osmosis and diffusion and describe how molar concentration affects diffusion. We havenow observed how solutions diffuse in di fferent situations, always from a high concentration to a low concentration, and how molar concentration affect diffusion, as the molarity goes up, more solution is diffused. We hypothesized that because molecules diffuse down a concentration gradient, the mass of the dialysis tubes will increase, and also that as the molarity increases, the percent of change in mass will also increase. Our data did arrest our conclusion.Exercise 1 proved that water moves across the selectively permeable membrane of the dialysis tubing much easier than sucrose sugar does. The water travel to reach equilibrium between the solutions. Sucrose must be as well large a molecule to pass through the membrane quickly. Exercise 2 showed that the potato samples took in water when immersed in a distilled water solution. Potatoes must contain sucrose molecules due to the conclusion of this lab because the potatoes take in water in the distilled water beaker. Potatoes had a lower water potential and higher solut e potential than the distilled water. It is just the opposite inside the beaker. flora CitedPHSchool The Biology Place. Prentice Hall Bridge Page. Pearson Education, June 2007. Web. 12 Sept.2011. Moulton, Glen E. Cell Theory, Form, and economic consumption Fluid Mosaic Model of Membrane Structure and Function Infoplease.com. Infoplease Encyclopedia, Almanac, Atlas, Biographies, Dictionary, Thesaurus. large-minded Online Reference, Research & Homework Help. Infoplease.com. Web. 14 Sept. 2011. http//www.infoplease.com/cig/biology/fluid-mosaic Bowen, R. (2000, July 2). Osmosis. Retrieved February 14, 2009, from http//www.vivo.colostate.edu/hbooks/cmb/cells/pmemb/osmosis.html Sheppard, T. (2004). Diffusion and Osmosis. Retrieved February 14, 2009, from http//www.blobs.org/ comprehension/article.php?article=20 Campbell, N. A., & Reece, J. B. (2005). Biology (7th ed.). New York Pearson Education Inc.