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Investigation to find out the affects of osmosis in a potato.

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Investigation to find out the affects of osmosis in a potato Aim: We are going to find out the affect of osmosis in a potato. Looking to see where the concentration changes and where water is lost or absorbed. Also we will investigate how the mass and length changes. Prediction: I already know from my research that osmosis is, "The movement of liquid from a high concentration, to where there is a low concentration, through a semi-permeable membrane" With this knowledge I can predict that the higher the concentration of water in the cup, the more water will be absorbed by the potato. Therefore the mass of the potato will increase. When the concentration of water in the cup decreases, the amount of water being absorbed will become less. This will continue to a certain point when the concentration of the potato is greater than the water, and the potato will release water. After looking at results from a previous experiment I can say that when the concentration was over 7%, the potato absorbed water and it grew. This backs up my prediction. ...read more.


Diagram: We left this overnight to allow time for any changes to happen. We left them on a window sill, covering the top with cling film. We covered the top with cling film to keep it a fair test. Using cling film made it so that nothing could get in to affect the solution, but also so that no water would evaporate. Preliminary Results: The table below shows the before and after weights and masses of three potato chips, we chose to do three as it is a good number to show a short trend. Before After Concentration Mass (G) Length (Cm) Mass (G) Length (Cm) 5% 3.84 4.7 3.08 4.5 10% 3.27 4.5 2.79 4.1 15% 3.57 4.7 3.05 4.4 Going up in groups of 5% is a big enough range to give us a wide variety of data. But it is also small enough to keep the data relevant to the experiment. I can already see a result which I think is wrong, but when I have completed a full test I can determine whether the result is wrong, or if my prediction is wrong. ...read more.


taken from a different potato, meaning it had a different concentration -The container was not covered with cling film -Measurements were taken wrong By drawing on the line of best fit, it helps to show how my results should have been and from this I can see that my prediction was right. Evaluation: I am disappointed that I could not make a unanimous conclusion but obviously our results were wrong. Even though the conclusion was not clear, I think that if we had taken a bit more time, we could have had better results. By drawing on a line of best fit I think it shows the trend and how our results should have been; but unfortunately they did not turn out this way. I think that over all we carried out the experiment well, doing everything safely and keeping everything as a fair test. It is plain to see that at some points we made mistakes but overall I think we did well. If I were to do the experiment again I would take more time setting up the experiment, making sure that every detail was right so that we would get the correct results. Ben Marlow - 11RJ ...read more.

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