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does osmosis affect the mass of potato cells?

Extracts from this document...

Introduction

Introduction: How does sugar concentration affect our body cells? This investigation will be trying to find out that however to make the question more direct to the test I shall alter it to " does osmosis affect the mass of potato cells?" Osmosis is the movement of H20 (water) from a higher concentration through a semi permeable membrane into low concentration. Osmosis is used by all living creatures as an important feature to life for example a root uses osmosis to absorb water from the soil around it. "Osmosis is the net movement of water across a partially permeable membrane from a region of high solvent potential to an area of low solvent potential, up a solute concentration gradient. It is a physical process in which a solvent moves, without input of energy, across a semi permeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.[1] Osmosis releases energy, and can be made to do work, as when a growing tree-root splits a stone". Quoted from Wikipedia Computer simulation of Osmosis Finding more about Osmosis and how it works could help improve our understanding of diabetes and how to produce a permanent cure to it. This would dramatically change the lives of so many people. I believe that the project will have some effect, as it working similarly to a sponge in water; the water goes into the space in the sponge that the air left behind. ...read more.

Middle

So the water from the solution would transfer in the cell with the lower level of water but the higher sugar level. Planning to collect good data Our group made the investigation fair because we used 5 potatoes on each concentration meaning we would have many results giving us a better average and a better result. We repeated the whole test using all the concentrations twice as this gave us two averages making sure our original was not corrupt. The concentrations we used were 5% sugar 10%, 15%, 20% and 30%. In order to keep the test fair and accurate we used the same size potatoes and using a stopwatch to keep the emersion time constant in all the tests. The accuracy of the equipment was down to the condition of the scales and stopwatch when they were under our use. Results shown in grams % Mass Before Mass After Size of chip Time (minutes) Difference and % 1 5 1.77 2.01 2cm 10 0.24 = 13.56% 2 5 1.72 1.83 2cm 10 0.11 = 6.4% 3 5 1.72 1.93 2cm 10 0.21 = 12.21% 4 5 1.68 1.75 2cm 10 0.07 = 4.17% 5 5 1.73 1.79 2cm 10 0.06 = 3.47% 1 10 2.01 1.97 2cm 10 -0.04 = -1.99% 2 10 1.97 1.7 2cm 10 -0.027 = -13.71% 3 10 1.67 1.96 2cm 10 0.24 = 17.37% 4 10 1.83 1.93 2cm 10 0.1 = 5.46% 5 10 1.82 1.86 2cm 10 0.04 = 2.20% ...read more.

Conclusion

Evaluation I feel that these results may not have been the most accurate; I predicted that the 30% solution would have been the more effective at increasing the weight of the potato slices and I still believe it would do so after this test. My theory was that because the sugar in the solution was higher than the potatoes cells the water from the potato cells would transfer through the cells membrane and into the solution because of its lower concentration of water. Anomalous results may have occurred because of defective cells in the potato, for example cells that have already died cannot transfer water, as they are immobile. As I said earlier I don't think my result were terribly accurate so in order to back up my prediction I could re-do the test, but this time take two sets of results in case the first or second result are incorrect which could have been the possibility with this test. As I'm not sure if I do have enough correct data I cannot yet give a certain conclusion and anything said could be incorrect. I don't believe that the equipment used, apart from the potato and the solution, could have changed the final results because they have no real purpose, apart from containing, timing and weighing which they all seemed good at doing. The method used I feel was fine, I could have used a better environment though, one that didn't involve me moving too much to reach the electronic scales or the test tubes etc. ...read more.

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