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Investigate the effect on potato chips in different concentration of sugar solutions

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Aim: - To investigate the effect on potato chips in different concentration of sugar solutions. Introduction: - Osmosis is the net movement of water molecules from a region where there is a higher concentration of water molecules to the region where there is lower concentration of water molecules. The water molecues move through a partially permeable membrane, which allows the smaller molecules to pass but not the big ones. The diffusion of molecules from the region of higher concentration to the region of lower concentration until the concentration of water molecules has become same in both the areas. Precautions to make the test fair: For a fair test certain factors had to be kept in mind. I decided to choose sugar solutions of different concentrations so that I get different sets of result containing information about the change in mass, change in length and the mass and length of potato chips after the experiment. If any of the factors were not kept constant it would mean that the test is not fair. Such as: - * All the potato chips have to be of the same length so that the area at which osmosis occurs is the same. * Doing all the tests at one temperature will control the temperature. For the purpose of my experiment I am going to do all the experiments at room temperature. ...read more.


4. Using a measuring cylinder I measured out different amounts of sucrose solution and distilled water, which I then poured into the test tubes in a percentage ratio giving me the various molar concentrations. 5. I then weighed every potato chip on an electronic balance and recorded the weights. 6. I swiftly put 3 potato chips into each beaker and then started my stopwatch. Chips were used to create an average, which gave me a better set of results and more accurate graphs. 7. Whilst waiting I set out some paper towels with which I was going to dry the paper and I drew up a basic table for my results. 8. After 3 hours I drained out the solutions in the sink and placed all the chips on the paper towel in the order I had put them in the test tubes as to not confuse myself as to which chip came from which solution. 9. I dried each chip with the paper towel and then placed each one on the scales so that I could weigh them. 10. Each potato was measured accurately on the electronic scales and then the weights were recorded. 11. As I had time after doing the first set of results I redid the experiment under exactly the same conditions. This gave me secondary set of results, which gave me a more accurate view on the changes. ...read more.


0.10m, 1.15m, 1.20m, and so on. This way would have allowed me to also find out the isotonic point far more accurately as the one that I estimated is very approximate. The cutting of the potatoes was the most difficult part of the experiment as although I was recording my results by mass, it could well have affected the surface area and so the overall rate of osmosis. As well as the potato I could have found a more accurate way to measure out the solutions and to determine the molar concentrations. Perhaps I could have used a burette. This would ensure that I have an accurate amount of fluid in each test tube. I could also weigh each chip on a more accurate scale, e.g. not to 0.00g but to 0.0000g.There were not any out of the ordinary results, but some were not as close to the line as others. This may have been caused by human. When the potato chips were removed from the test tubes and dried I may well have dried some potatoes more thoroughly than others and so some would have more excess water, which would add to the mass. If the experiment was repeated I could find another way to dry the potatoes that would ensure that all were dried in the same way for the same time. However with all this said I think that the experiment was truly successful and I was very pleased with the complete comparison of my results with my initial prediction. ...read more.

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