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To investigate osmosis in potato chips placed in different concentrations of sugar solution.

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Introduction

OSMOSIS Osmosis is the movement of water from dilute solution to more concentrated solution through a semi-permeable membrane. Aims: To investigate osmosis in potato chips placed in different concentrations of sugar solution. Apparatus: 1. 6 test tube 2. Pure water 3. 1Molar sugar solution 4. Clean potatoes 5. 1 borer 6. 1 measuring cylinder 7. 1 scale 8. 1 ruler 9. 1 knife Plan: Firstly, I need to make six solutions with different sugar concentration. I will mix the 1M sugar solution with water. The amount of water present in the solution will determine the overall concentration of the solution. For example, in order to get 10mm� 0.6M solution, I will use the measuring cylinder to get 6mm� sugar solution and 4mm� pure water. The solution now contains 40% water and 60% sugar solution, which is 0.6M. On the other hand, the 1.0M solutions will have no extra water added in and the 0.0M solutions will be pure water. I will then make 18 identical potato chips each with length of 20mm and diameter of 5mm. The potato chips will be dried. The mass, length and volume of each potato will be recorded. ...read more.

Middle

So the water will escape from the dilute part (the potato chip) into the more concentrated part (the solution). It makes the potato chip shrink (loss mass and volume). * In some solution, the volume and mass of the potato chip may stay the same because the concentration of water is identical in both sides. Line of best fit Conclusion: The experiment proved that my prediction was right. In the most concentrated solution (1M), the potato chips lost mass by an average of 0.230g. The length decreased by 4.667mm on average and caused the volume to decrease too by 91.431mm�. In the most dilute solution (0M), the potato chips gained mass by an average of 0.123g. The length increased by 2.333mm on average and caused the volume to increase too by 46.014mm�. The graphs show a clear pattern. The values on the Y-axis decreases as the value of X increase, which means that the value of Y is inversely proportional to the value of X. On the graph, the value of Y represents the difference in mass/volume, and the value of X represents the concentration of the solution. ...read more.

Conclusion

3. Repeat measurements more and use a wider range of solutions. We used six solutions of different concentration (0M, 0.2M, 0.4M, and etc) and put three potato chips in each test tube. It should be better if we used 11 solutions of different concentration, (0M, 0.1M, 0.2M, etc) and put 5 potato chips in each test tube. This can give us a wider range of data and the results should be more accurate. During the experiment, I also noticed that when identical potato chips are put into solutions of different concentration, they all float at different depth. This is because the concentration of sugar in the solution affects its density. The solution is denser if it contains more sugar. So, if a potato chip is put into a very concentrated solution, it should float at the top because the potato chip itself is less dense than the solution. In conclusion, osmosis is very important in living organisms. Cell membrane contains solutions of various substances in water. These substances must be kept at reasonable concentration all the time for the cell to function properly. So, water must be able to get in and out of the cell. This happens by osmosis and the whole process is called osmo-regulation. END Roy He Thursday, 03 May 2007 ?? ?? ?? ?? 1/1 Year 10 Coursework Roy He 03/05/2007 ...read more.

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