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Osmosis Investigation

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Osmosis Planning We have been asked to investigate the effect of osmosis on potato chips. Osmosis is the diffusion of water from a lower concentration of solute to a higher concentration of solute, through a membrane. I have chosen to investigate the effect of the water potential/concentration of solution on potato chips. This means that I will put potato chips into salt solutions of different concentrations. * The other factors involved are: * Temperature * Water potential of potato initially * SIZE of potato * Light intensity * Mass of potato dependent variable * Volume of solution potato chip is in * Type of potato * Time left in solution * Surface area of potato chip If I am to conduct a fair test, I will need to control these other factors. Completing the tests in a constant temperate environment will control the temperature. For the purpose of my experiment I am going to do all the experiments at room temperature, which is as accurate as practically possible. To keep the water potential of the potato will be initially kept the same by using the same type of potato, all of which have been treated in the same way, e.g. ...read more.


I will place all the chips as quickly as I can and then saturate the stopwatch, for 10mins. I will then remove all the solutions from the test tubes as quickly as I can, (so that the chips do not carry on changing weight, and the test is kept as fair as possible), and I will then weigh them and record the results. These will then be put into tables and will be used in graphs. I will also measure the temperature in the room. I am going to do the experiment three times, in each solution, and I will then take an average to have a fairer reading. One result may not be accurate because of human error, so to eliminate all possibilities of inaccuracy I will repeat it. I must also do at least 5 types of concentrations, to have sufficient results and to see if my prediction is correct, and I am going to do 7. Here is the equipment I am going to use: Test-tube rack Test-tube filled Beaker filled with solution Stopwatch Scalpel Paper towel Prongs holding chip Results: Concentration Water: Salt Mass at Start (g) ...read more.


not to 0.00 but to 0.0000g. I could extend my enquiry by testing the percentage change in mass with concentration using a different substance. By this I mean using a different vegetable, perhaps celery or cucumber. Then I could find out whether osmosis occurs with the same patterns and trends with any vegetable. I only really found one anomalous result and that was for the 0.6 molar solution I could've also taken results with other substances dissolved into the water, such as sugar. I could have taken results of more concentrations. This way I could have found the isotonic point by there being no change in mass. This would show the water potential of the potato, and this result could then be used further. Also to make my experiment better I could have repeated it more. I could have also used cloned potatoes, so that they would have all been the same. I could have also cut the potatoes into ring doughnut shapes, because the cells in the centre of the potato may have a different capacity of water and the intake, or distribution of it, or different water potentials. If I had cut the potato into doughnuts, I would have only been using the out side of the potato, leaving out the middle. I could have also used a machine to cut the potato chips. ...read more.

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