Osmosis in Potatoes

2217 WordsNov 9, 20059 Pages
AT1- Osmosis In Potatoes Aim: Investigate the movement of osmosis through a selectively permeable membrane, in this case potato. Introduction: Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes from a region of high concentration to a region of low concentration, until the two concentrations are equal in concentrations of water. Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living organisms, for example, in the transport of water from the soil to the roots in plants. If a cell is in contact with a solution of lower water concentration than its own contents,…show more content…
Graph 2 shows the average change in length. Basically, the pattern is the same as average weight loss in graph 1. It shows how osmosis is affected by different concentrations. Method After having done our preliminary work, we knew exactly which measurements we needed to use in order to obtain the correct sort of results. We set up 14 test tubes, because in order to save time, we intended on doing repeats at the same time as the original experiments were going on. For organisation's sake, we set up all of the test tubes at once, and labelled them individually to avoid confusion later on. Into each test tube, we poured 15mls of Glucose solution, and added one of the potato chips, each weighing around 1 gram, and measuring 33mm by 5mm. In order to make it as much of a fair test as possible, we added the potato chips very quickly, to make sure one chip didn't have a longer amount of time in the solution than another. We then left each one for 30 minutes. After 30 minutes, we emptied each test tube, leaving only the potato chips inside. Before we measured and weighed each chip, we dabbed them with paper towel. If we had of left excess water on the chips, the weights would not be accurate. We then measured the chips in mms because they are a more accurate
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