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Osmosis on Potato Chips

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Osmosis on Potato Chips Plan 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 salt-water concentration of solution on potato chips. This means that I will put potato chips into salt solutions of different concentrations. These concentrations would be ones such as these; 5%, 10%, 15%, 20% distilled water. There are other factors involved and these are; * Temperature * Size of potato * Light intensity * Mass of potato * Volume of solution potato chip is in * Time left in solution * Surface area of potato chip If I am going to conduct a fair test, then I am going to have to control these other factors. Doing all the tests at one temperature will control the temperature. For the purpose of my experiment I am going to do all the experiments at room temperature. The size of the potato is very important. This is because if the size of the potato varies, so will the amount of mass is looses or gains. I will cut all the pieces of potatoes, to the same size. ...read more.


Each chip will be left in each solution for 30 minutes. I could have a number of experiments going on at once so that I save time. The range of my variable is suitable, because I have at 5 concentrations, and I will have more results to make more accurate conclusions. I will remove any excess water by rolling the chip on a paper towel, keeping each surface on the towel for 2 seconds, making sure that I do not squeeze the chip so that my results are fair. I have decided that I am no longer going to use 50ml of solution for each chip, because this is proved to be too large, therefore I will only need to use 25ml. I also must make sure that the solutions must be removed from all the test tubes after 30 minutes to have a fairer test. I am going to do each experiment at the same time. The more results I get the more accurate my graph and results will be, so when I come to do my actual experiment I will repeat it. I must also make some labels to label my test tubes with so that the test tubes do not get mixed up. ...read more.


I could also use a burette measure out my solutions. This would ensure that I have an accurate amount of fluid in each test tube. I could also weigh each chip on a digital and more accurate scale, e.g. not to 0.00 but to 0.0000g. There were not any anomalous results, but some results were not as close to the line as others. This may have been caused by human error, or on out of my six results could have been inaccurate, and changed the average drastically. Or perhaps the potato chip was not cut accurately, or that part of the potatoes, cells did not loose/gain mass well. Further work involving the process of Osmosis and this experiment is quite limited. We could leave the potato chips over a longer period of time to see if Osmosis takes place on a larger scale. Or, we could add more concentrated solutions, i.e. use 25% and 30% concentration. The main thing that we could change was the membrane that was used; something else could be used instead of a potato. I could extend my enquiry by testing the percentage change in mass 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. ...read more.

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