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Osmosis in Potato's

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Osmosis in Potatoes (To show how osmosis in potatoes takes place) Introduction: Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration, this basically shows us that osmosis is a type of diffusion but in osmosis there is only the movement of water molecules from a region in which they have a higher concentration to one in which they are in lower concentration of water molecules. This basically means that the net movement of the solvent is from less concentrated (hypotonic) to more concentrated (hypertonic) solution which tends to reduce the difference in concentrations. This takes place through a partially permeable membrane e.g. that of an animal. Osmosis takes place in cells and can also take place in solutions. When a cell is submerged in a glass of water, the water molecules pass through the cell membrane and the process of osmosis takes place. The cell membrane is selectively permeable, so only necessary materials are let into the cell and waste products are given out. It usually occurs in plant cells and animal cells e.g. in humans when water moves from the digestive system into the blood stream and in plants when water goes from the soil surrounding the plant into the root hair cells and then to the cytoplasm. ...read more.


In the trail run we used one piece of potato per solution which was dug out using a size 6 cork borer and a ruler to make the length 3cm long. The piece of potato was kept in 3 different types of solutions which are given below as well as the changes in mass and the percentage change: Mass of potato before immersion Volume of sol. potato kept in. Mass at end of experiment Difference in mass Percentage change 1.63g 12g of sugar sol. 2.01g +0.38 23.3% 1.76g 6g water and 6g of sugar sol. 1.46g -0.3 17% 1.63g 12g of water 1.29g -0.34 20.9% I also decided to keep the temperature the dame as it was kept at room temperature during the trial run. I am going to change the concentrations of sugar solution that will be used and keep the temperature at which the experiment will be kept will remain constant. I decided that changing the size of the potato would be best because it would be easier to place three pieces of 2cm potato in one test tube containing the solution as well. We are planning on doing repeats so that the results are more accurate and this will help us find out the rate of osmosis more precisely. ...read more.


I think it would be better to use separate test tubes because in this experiment the sides of the potato pieces were in contact with each other and that nay have affected the osmosis that was taking place as the surface area may have been decreased due to this. If they were kept separately osmosis would have taken place into the piece of potato from all sides and that would have had a great effect on the changes that take place. I think the potato measurements were taken as carefully as possible and that helped my results to be as accurate as possible. The measurements of the mass were taken in two decimal places and that made my results as precise as possible. The cork borer was size 6 and helped to make cylindrical measurement of all the pieces as close as possible to each other, after that a ruler was used to determine the length. This made it as accurate as possible because all the pieces were the same. Using samples from the same piece of potato may have helped however with the experiment because sometimes sugar concentrations largely vary in different parts of the same potato. http://www.scienceray.com/Biology/Botany/Osmosis-in-Potato-Cells-Investigation.116322 - shows coursework ?? ?? ?? ?? 1 ...read more.

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