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My aim throughout this investigation is to investigate the movement of Osmosis through a selectively permeable membrane which in this case is a potato chip.

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Introduction

OSMOSIS IN POTATOES. My aim throughout this investigation is to investigate the movement of Osmosis through a selectively permeable membrane which in this case is a potato chip. INTRODUCTION. Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes through from a high concentration to a place where the concentration is lower. Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living organisms i.e in the transport of water from the soil to the roots of a plant. If a cell is in contact with a solution of a lower water concentration than its own concentration then the water will leave the cell by osmosis, through the membrane. If you put a plant cell into water, water will enter the cell by osmosis and therefore the cell will increase in size and weight. Even though water will enter it will not get to a point where the cell will burst. ...read more.

Middle

as quickly as we could so that one potato chip didn't have any longer than the others. We left each one for around 30 minutes. After 30 minutes we emptied the petri dishes leaving only the potato chip inside. Before measuring and weighing each chip we put them onto a paper towel to remove any excess water that were on them otherwise the results would not be as accurate as they could be. We then measure the chips in mm as this is a more accurate measurement and weighed them in grams. FAIR TEST. This experiment will have to be kept as fair as possible otherwise the results would not be accurate enough. There are many thing that must stay the same. The room temperature, the size of the potato chip as it goes into the solutions, the time the potato is left in for and also the way of measurement or weighing at the end. The only thing that will change during the experiment is the concentration of the sugar or water solution. ...read more.

Conclusion

EVALUATION When it came to accuracy during this investigation it wasn't that easy. Having to keep things such as weight and length the same sounds quite simple but when you put this in to practice it doesn't work out quite the same. Even if you cut all potato chips to the same length it was very unlikely that they would all weigh the same. Another thing that I thought was not done very well was when we pulled the potatoes out of the petri dishes we had to dab them with a paper towel in order to remove some of the excess water but by doing this we could not be sure that we wernt removing any water that was not excess. Some of the results were anomalous and therefore something must have gone wrong somewhere. If I were to do this investigation again I would perform the experiment more times before hand so that when it came to the real one I would have more experience in knowing what do do and what not to do in order to keep the results as fair as possible. ...read more.

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