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Does the concentration of a solution affect osmosis? -- A* - page 8
Keywords: Biology Osmosis Concentration Sucrose solution
By georgie1 on 31/12/2009
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 8 of 10 pages: 1 2 3 4 5 6 7 8 9 10a much longer time than when water molecules diffuse into the cell and cause the cell to become turgid.
Overall, it is clear that the movement of water through a selectively permeable membrane is affected by the concentration of sucrose solution. The investigation has proved that water molecules move from an area of high water potential to lower water potential, through the membrane. When the solution is low in sucrose, there is an increase in osmotic activity, increasing the kinetic energy of the molecules. As the balance of sucrose and water in the solution and in the potato cutting become equal, the kinetic energy decreases and therefore the osmosis reaches an equilibrium.
Evaluation
Data Collection
Personally, I only collected one set of results for each measurement. However, I collaborated all of the results of the class which provided me with at least ten results for each reading. This provided me with enough evidence to draw a firm and sensible conclusion because I had clear and consistent patterns. On the whole, my results tend to be accurate and results gathered by various people are very similar, showing that the experiment has been carried out fairly and thoroughly. The anomalies in the results that I have highlighted in my results table have not been included in the averages and therefore these had no effect on the graph. It appears that it was a consistent person that was providing anomalies in comparison to the other results, which may mean that they did not control one of the additional factors as they well as they potentially could have. I did not repeat these results because I still had a large number of readings for each experiment. However, if I was to repeat this experiment and had more time, I would have repeated these results so that I had a more reliable average. The anomalous result that I measured I repeated, so that I had a more accurate result to include in my average. The difference in my anomalous result and replacement result was not vastly different in terms of grams; however the percentage difference was more significantly different. I know that it was important that I repeated this result because my average is much more reliable than it would have been if I had used to inaccurate result.
Both lines of best fit pass through the error bars, showing me that my results are fairly accurate. However,
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