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Planning an experiment to determine what factors affect osmosis

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Planning an experiment to determine what factors affect osmosis Safety: * Cut the potato cylinder using a razor on a white tile * When cutting with the razor, be careful not to chop your fingers off * Be careful not to get any of the salt solution in your eyes, as it will bring out all of the water from your eyes and render them useless Fair Testing: * I will keep the amount of solution, 10cm3 the same throughout all of the test tubes , because otherwise some pieces of potato will be able to diffuse water quick and easier than others, and so the results will be inaccurate * Ensure that you take all the pieces from the same potato, as otherwise the results will be messed up, because different potatoes have different properties as they have been grown in different places * Make sure that you dry each potato piece the same way as if you don't then the experiment will be ruined, as there will be either be too much or too little water remaining on the potato piece * ...read more.


Then find the average for the osmosis through different salt molar solutions using the two results for each concentration that you obtained. Apparatus: * White tile - for cutting on * Razor Blade - to cut the potato pieces * Distilled water - part of the experiment * Cork borer - to cut out the potato cylinder pieces * Tissue Paper - to dry the potato pieces after the experiment * Electronic Weighing Scale - to weigh the individual pieces * 10 cm3 Measuring Cylinder - for measuring the solutions * Potato - main part of the experiment * Five Test Tubes - for the experiment Factors affecting the experiment: > Surface Area - the greater the surface area, the faster osmosis can occur > Whether the ends of the cylinder are cut off - osmosis cannot occur through the skin of the potato, and so unless the ends are cut off, the surface area through which osmosis can occur will have been reduced > Different Potatoes - each potato has different concentrations of each substances depending on where, when and how it was grown ...read more.


Previous Research: Previously, I did a preliminary experiment to establish a range of experimental solutions. I applied the same method as above except I used a different range of concentrations: 0, 0.2, 0.4, 0.6, 0.8, 1.0. From the results of this preliminary experiment, I established that the point where no osmosis occurs is around 0.15 molars of NaCl solution. So when I repeated the experiment, my range was narrowed down to 0.1, 0.15, 0.2, 0.25 and 3. Results: From my results, one can see where the exact point is where no osmosis occurs. You can see that as the concentration of NaCl goes up, the potato pieces stop gaining water, and start losing water. Conclusion: I am very happy with these results as my objective was accomplished successfully and I had no trouble with the experiments. My results are very close to what I predicted, as I predicted that the point where osmosis would no longer occur would be roughly 0.2 molars, when it was nearer 0.18. I think my results came out right as I executed the experiment with a lot of planning and precision. ...read more.

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