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Investigation of the rate of Osmosis through Potato Chips.

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Investigation of the rate of Osmosis through Potato Chips Introduction I am investigating the rate of osmosis through potato chips using a range of concentrated sucrose solution. I will use seven concentrated solutions of varying strength in order to assess their impact on the potato chip. The definition of Osmosis is: "the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration." Quoted from CGP Double Science Biology the Revision Guide Variables The variables that I will be keeping constant are: The Length of the potato chip. The potato chips need to be of identical size because if the chips were different sizes there would be different total surface areas. This would lead to more/less osmosis, as there would be more/less cells in the potato that will actually lose water or gain water. The Volume of the concentrated solution. Each boiling tube will contain the same amount of sucrose solution. This will be achieved by using a measuring cylinder. If differing volumes of solution were used this would cause osmosis to take place at different rates resulting in inaccurate results. The Timing. The amount of time the potato chip is left in the sucrose solution is important. The longer the potato chip is left in the solution, the more time there is for osmosis to take place. ...read more.


If the chips are touching, surface area is being lost causing the chip to do less osmosis. I will be repeating the experiment at the same time. This will happen by placing two potato chips in the boiling tubes and then taking the average for a more average result. This way I will receive a far more accurate result. I will maintain the experiment that the accuracy of the experiment will be ensured; by keeping all the variables constant; and ensuring that a fair test is carried out all the way through the experiment. Method 1. I got all the apparatus required and placed it onto my workbench. 2. I made up all the ranges of sucrose solutions. The total volume added to a total of 20cm3 3. They were then placed into their boiling tubes and marked their concentration on boiling tube. 4. The chips were then measured to 50mm with the ruler and cut to size with the razor blade, and so the chips would not be harmed they were placed on a white tile. 5. I then removed the skin from potato chips so it did not harm the surface area 6. Following that; 2 potato chips were placed into one of the concentrated sucrose solutions. Then a 1-minute interval took place measured by the stopwatch. The next two chips entered the concentrated sucrose solution and so on untie all 14 chips had entered the concentrated sucrose solutions. ...read more.


In my case the isosmotic point is ... The isosmotic point is where the line of best fit meets the x-axis. At this point there is no net movement (H20 movement). Looking back at my prediction I was correct in my prediction when predicting when the chip would get smaller in length and when the chip would get larger in length. Evaluation I feel my method was fairly accurate. The reason I say fairly is because I managed to attain an anomalous result. This may have happened for many reasons due to lack of concentration. I may have miss-timed that certain chip. However in conclusion I do believe my results were accurate because when my line of best fit was drawn the crosses were very close to the line so this proves the results were accurate. Therefore they are also reliable to use. I believe the way 2 improve the experiment by having chips which are the same thickness let alone length because if a chip is different size in thickness but same size in length the chip with the larger thickness will have more cells which will contain water causing the chip to get bigger otherwise this will be treated as an unfair test. Another way to improve the test is my by having newer equipment this will enable students to get even accurate results. For future experiments I believe one could test the experiment with heat. This would be conducted over a Bunsen burner and because of kinetic energy increasing the rate of osmosis the potato chip would get even bigger and smaller. 1 ...read more.

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