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Investigating The Concentration Of Glucose Inside Cell Sap In Potatoes Through Osmosis.

1813 words - 7 pages

In the following experiment I will be investigating the concetration of glucose in the cell sap of a potato cell by weighing the samples of potato before and after soaking them in a concetrated glucose solution. I predict, that the stronger the solution of glucose, the more weight the piece of potato will lose, and when placed in a more dilute glucose solution, the potato will gain weight.This is due to Osmosis, the movement of water molecules from an area of high concetration to an area of low concentration. The cell membranes are permeable to water, and so if the glucose concentration inside the cell is more concentrated than the solution it's placed in, water molecules will pass through the cell wall to the solution, causing the potato to gain weight.For this experiment I will be using small cylinder shaped pieces of potato, 5cm long, and cut with a cork borer to ensure the same width for each piece. I will be finding out the concentration of glucose inside the cell sap by controlling the same amounts of different glucose solution of a different concentration. I will be weighing the mass of the potato before and after placing it in the glucose solution, and measuring the amount of weight gained, or lost, once soaked for exactly ten minutes.EquipmentStopwatchCork BorerRulerElectronic Weighing ScalesMeasuring BeakerPetre DishesI will be making my test as fair as possible, by ensuring I have enough data to note down the average results. I will be doing this by placing three pieces of potato into each petre dish filled with the same amount of desired concetrated glucose solution. All three pieces must be exactly the same size, and so I will be measuring to make sure the length of each piece is exactly 5cm, and by using a cork borer to cut the pieces from the potato, they will all be the same width. To ensure my results are as accurate as possible, each piece of potato must be kept in the solution for the exact same amount of time. This will be done by using many stopwatches, and once the first samples of poato have been in the required concentrated solution for three minutes, the next pieces will be placed in the corresponding dish to soak. By doing this, I can ensure I have enough time to note down my results in a table, before having to take down the next set of data.To make the test safe, I will :Make sure to be careful when cutting the potato to it's desired length and width.Make sure all surfaces are clean to avoid germs breeding.Keep the dishes safely away from the edge of the work surface, to avoid breakage.After writing up my results in the form of a graph, I can see now that there is a definate pattern to my data. The results show me that the stronger the concentration of the glucose solution in which I soaked my pieces of potato, the more weight each piece lost. This is due to Osmosis, when the concentration of the liquid in which the potato soaked in was more concentrated than that inside the cell sap of the potato. The water molecules...

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