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Potato and Osmosis Investigation.

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Lewis Janes 11a Potato and Osmosis Investigation General Introduction I am trying to discover how osmosis is carried out and how it is affected by different concentrations of sugar solution. The key factor I plan to investigate is sucrose concentration, I will vary the sucrose concentration and calculate the effects of this factor on osmosis in the potato chips by recording the mass before the chip is placed in the solution, the mass after and the difference between them. I will finally calculate the percentage change and the required averages. In this experiment a potato will be cut to certain lengths (2cm), measured and placed into a sugar solution over a period of 48 hours. They will then be measured again to see if osmosis has occurred. (The potato chips will be covered in 30cc of solution to ensure that every one is completely covered). Apart from the concentration of 0.0mol/litre the solutions have been made up before hand. The different solutions being used are: 0.0M (Molar concentration) 0.2M 0.4M 0.6M 0.8M 1.0M There was some previous work that influenced my planning this was absorption. Absorption is the taking up of one substance by another, such as a liquid by a solid or a gas by a liquid (ammonia by water). ...read more.


This is because the measurements may vary slightly between scales. Apparatus Potato Six concentrations of sucrose solutions (0.0M, 0.2M, 0.4M 0.6M, 0.8M, 1.0M) Water (for part solution) Electronic Balance Measuring Cylinder Core Borer Beaker Petri Dish x6 Scalpel Coloured Markers Explanation A range of sucrose sugar solutions will be prepared with concentrations 0 molar, 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar and 1 molar. This will be done by adding varying amounts of distilled water to varying amounts of sucrose solution. Sections of potato will be cut using a scalpel/core borer and will be measured using a ruler. This part of the preparation must be done very accurately as a change in the surface area may allow more or less osmosis to occur. The mass of each chip will be measured as well so that more results can be obtained. Three chips will be placed in each test tube each time so that I can take an average for each tube. I will use 10ml of each concentration of sugar solution and once in the test tubes they each will be labeled. The potato pieces will then be placed in the different test tubes and then left for 48 hours. Then the potato pieces will be removed, the surface solution removed using paper towels and then they will be re-weighed. ...read more.


This might have either taken some water out of the potato or it might have left some excess water on the potato. This part of the experiment is difficult to come up with an accurate and fair method, as other ways would also lead to some slight mistakes. Also the potato itself was not exactly the same size (I may have ran out of time and just lined the potato chips up and cut them in a straight line), although I did try to cut them to 2cm each. I could also extend the experiment to a more exact level by looking at the potato cylinders under a microscope, and then I would be able to see the cells in greater detail and draw some more observational results. I could also have taken more results for each mass i.e. 5 instead of 3. This would have made the average mass more accurate. Finally, I could also investigate into the effects of other factors that effect osmosis in potato chips and again compare my results with these, as well as taking more repeat readings to improve the accuracy of my experiment. 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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