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How Osmosis Affects A Potato.

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How Osmosis Affects A Potato Aim: - To See How Osmosis Affects A Potato Preliminary work Prediction: -I predict that the weight of the potato in the sugar solution will decrease and the weight of water will increase. I predict that the weight of the potato in the sugar solution will decrease when it reaches 3:1 (salt: water). In put Variables: -Molarity -Size of potato -Mass of Water -Molarity of Sugar -Length of time in the solution -Temperature of water Out put variables: -Weight of potato Key variables: -Molarity of sugar. This is a key variable because it has the most effective outcome because osmosis only works when there are different molarities in and outside of the potato other wise the diffusion theory of osmosis wont work. We are going to keep a fair test by: - Keeping all the volume of water the same in each test tube - Keeping the starting weight of the potato the same to begin with - When removing the excess water of the potato make sure all excess water is removed but without squeezing any water out of the potato - Keeping the temperature of the water the same - Use the same type of potato (grown from the same potato) We will keep the experiment safe by making sure that all the test tube racks are in a suitable position so they wont easterly be knocked over. ...read more.


3. In one of the test tubes add sugar and mix it in with the water 4. Label this test tube sugar 5. Using a borer get two pieces of potato and cut the ends off. 6. Make sure that they are both the same size and weigh them 7. With a stop clock time 5 minutes for both of the potatoes bits when they have been dropped in the water so they both have the same amount of time. 8. After they have been in for 5minutes take them out with a pair of tweezers and get rid of any excess water with a tissue and weigh them both again. 9. Record the results in a table and continue every 5minutes for 30 minutes weighing and recording Apparatus: - Test tubes - Tweezers - Apple corer - Test tube rack - Labels and pen for test tubes - Balance - Scalpel for cutting potato samples - Beakers for measuring solutions - Tissue for drying potato samples Conclusion In conclusion my results show that the potato in the 0.00 molar solution increased in weight (g) by 9.74%, 0.5 molar decreased by 23.38%, 1.0 molar decreased by 38%, 1.5 molar decreased 44.44%, and 2.0 decreased 50%. From my graph I can see that lower the morality the higher the percentage of weight gain. ...read more.


We didn't have any anomalous results maybe because we mad sure that we left each potato in the solution an equal amount of time. Also when we removed access water we were very careful not to squeeze any water out of the potato other wise it would of made it an unfair test. To improve reliability and accuracy next time in the prim nary plan I would make sure that my prediction was detailed so I would understand everything much clearer in order to get a better set of results. Also the preliminary experiment next time will be a lot more accurate in the way that we should take more care in time that the potato is left in the solution for how ever long of a time it should be left in. The main plan could be longer and in more detail so that it is more clear to read and understand. The amount of results that we got was just about enough to work out and see weather the prediction was correct. This means that next time we should do more sets of results to get a more accurate outcome. To help back up this experiment we could use more chats of graphs showing rate of osmosis in time and other ways of showing how osmosis affects a potato. ...read more.

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