For example, freshwater and saltwater aquarium fish placed in water of a different salinity than that to which they are adapted to will die quickly, and in the case of saltwater fish, dramatically. The stronger the concentration of the glucose solution the more it will decrease in mass.
In extreme cases, the cell becomes plasmolyzed — the cell membrane disengages with the cell wall due to lack of water pressure on it. The purpose of this experiment is to demonstrate how living cells rely on osmosis, the diffusion of water.
During my preliminary test I also found that leaving the potato tuber in the test tube for 24 hours was not long enough to ensure that the process of osmosis was complete. A "draw" solution of higher osmotic pressure than the feed solution is used to induce a net flow of water through a semi-permeable membrane, such that the feed solution becomes concentrated as the draw solution becomes dilute.
It also is involved in facilitated diffusion. When the potato was put in a solution with high sugar concentration, the potato had a higher water potential low solute than the surrounding solution high solute so the flow of water went from the potato through the semi permeable membrane to the solution, causing the potato to lose water and therefore lose mass.
The more concentrated the salt solution, the bigger the difference in size and weight of the potato slice. All of these factors will affect the experiment due to the nature of the potato cells, but the only variable I will be changing is the concentration of the glucose solution.
If Effect of osmosis on potato medium is hypertonic relative to the cell cytoplasm — the cell will lose water by osmosis. Conclusion The potato tuber in the distilled water was the only one to gain in mass.
Amount of sugar in solutionPotato weight after experiment: The outer skin of a potato has different cells from those inside the potato and to stop this from affecting my results I will cut the ends off of all of my samples.
The interaction between them forms a film of potassium ferrocyanide at the vassel wall right.
Forward osmosis is an area of ongoing research, focusing on applications in desalinationwater purificationwater treatmentfood processingand other areas of study. The average mass change percentage was History The " endosmometer " invented by Dutrochet.
The graph and table have been attached overleaf. This is because both the solution and the potato would have had similar water potential levels, so their sugar concentrations were already even so osmosis had no effect. All of these factors will affect the experiment due to the nature of the potato cells.
The others decreased in mass. If the medium has exactly the same water concentration, there will be no net movement of water across the cell membrane. Crystals of potassium ferrocyanide are put into a solution of copper sulfate left. So for my actual investigation I have decided to keep them in for four days, this would give the potato tuber enough time to complete osmosis as best it can achieve; it would also give me a bigger range between each result recorded.
There is no net flow of water through the membrane. I will be carrying out my experiment on 15 separate potato chips. A potato tuber will be left in each solution for a period of 24 hours, I repeated each concentration twice times to try and get consistent results for each one.
Interpreting Data — Evaluating Evidence I believe that the experiment was successful as the results were as expected and were all in a similar range of one another; from looking at my graphs I can see that changing the concentration of the glucose solution affects the potato in differing ways according to the strength of the solution.
Potato 1 Potato 2Average weight between both potatoes 0 teaspoons21 grams23 grams22 grams 1 teaspoon21 grams19 grams20 grams 2 teaspoons18 grams18 grams18 grams 3 teaspoons17 grams15 grams16 grams 4 teaspoons15 grams15 grams15 grams Conclusion: The diffusion model of osmosis is rendered untenable by the fact that osmosis can drive water across a membrane toward a higher concentration of water.
This would make the graphs clearer and easier to notice any trends or patterns. This means that the mass of the potato piece will increase and the potato will feel turgid. Such a solution is called a isotonic solution. The molecules will continue to diffuse until the area in which they are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having a higher or lower concentration than another.
The diluted draw solution may then be used directly as with an ingestible solute like glucoseor sent to a secondary separation process for the removal of the draw solute.
Each sample will then be left completely for 72 hours. Many thermodynamic explanations go into the concept of chemical potential and how the function of the water on the solution side differs from that of pure water due to the higher pressure and the presence of the solute counteracting such that the chemical potential remains unchanged.
The weight of the potato left in water with 1 teaspoon of sugar in it is the same weight as before. The potato tuber in the 0m solution distilled water reacted as I expected it to, its mass increased as the concentration of glucose inside of the potato was greater than on the outside, thus the water entered the potato to try and create equilibrium.
Eventually, the force of the column of water on the hypertonic side of the semipermeable membrane will equal the force of diffusion on the hypotonic the side with a lesser concentration side, creating equilibrium.Effect of Osmosis on Potato Aim: To investigate the effect osmosis has on potato pieces that are placed in different concentrations of sugar solutions in water - Effect of Osmosis on Potato introduction.
Hypothesis: I believe that the more saturated the solution is the lighter the potato will be, and the potato in the clear. In this case study I will be looking at how osmosis affects a potato chip.
My aim is too investigate the effect of varying concentrations of certain salt. In this experiment I am going to investigate the effect of varying concentration of a differing glucose solution on the amount of osmotic activity, between the solution and a potato tuber of a given size.
The purpose of this experiment is to demonstrate how living cells rely on osmosis, the diffusion of water. Osmosis is [ ].
Investigation of Factors Affect Osmosis in Potatoes Aim The aim of the following experiment was to investigate the effect of varying the concentration of sucrose solution on osmosis in a potato.
Preliminary Experiments One preliminary experiment was done before the main experiment.
Osmosis is the process by which a liquid moves through a semi permeable membrane. Several factors affect osmosis including temperature, surface area, difference in water potential, pressure and concentration gradient. Osmosis occurs when there is a high solute concentration area on one side of a.
The Effect of Concentration Gradient on Osmosis Abstract: Osmosis is the passive movement of water from an area of higher concentration to an area of lower concentration, usually across a membrane (Thorpe ).
Tonicity is the ability of a solution surrounding a cell to gain or lose water (Reece ).Download