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# Examining osmosis in plant cells. I am using potato chips

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Introduction

Osmosis in Plant Cells Osmosis the diffusion of water molecules, during osmosis molecules move from a low sugar/salt concentration to a high sugar/salt concentration through a semi-permeable membrane. In this experiment, I am examining osmosis in plant cells. I am using potato chips because potatoes contain catalysts. My experiment involves soaking potato chips in different strengths of glucose solution to see if the mass of the potato chip changes. I predict that the mass will change according to the strength of the solution, as the strength of the solution increases the potatoes mass will decrease. This is because of osmosis, each plant cell contains a vacuole, and this filled with cell sap, which has its own solution strength. If the glucose solution I am soaking it in has a lower solution that the cell sap I will expect the potato chip to swell and increase in mass, if it has a higher solution then the potato chip should shrink. ...read more.

Middle

I should also measure the solutions properly (50ml) These are my results for reading one: Concentration of glucose solution (m) Initial mass (g) Final mass (g) Mass difference (g) Percentage mass change % Time left in the solution Length of the potatoes 0.0 5 6.42 1.42 28.40 1hr 30m 5cm 0.2 5 4.99 - 0.01 -0.20 1hr 30m 5cm 0.4 5 3.92 - 10.8 -21.60 1hr 30m 5cm 0.6 5 3.82 -1.18 -23.60 1hr 30m 5cm 0.8 5 3.61 -1.39 -27.80 1hr 30m 5cm 1.0 5 3.38 -1.62 -32.40 1hr 30m 5cm Reading two: Concentration of glucose solution (m) Initial mass (g) Final mass (g) Mass Difference (g) Percentage Change % Time left in the solution Length of the potatoes 0.0 5 6.20 1.20 24.00 1hr 30m 5cm 0.2 5 5.11 0.11 2.30 1hr 30m 5cm 0.4 5 3.98 -1.02 -20.40 1hr 30m 5cm 0.6 5 3.47 -1.53 -30.60 1hr 30m 5cm 0.8 5 3.43 -1.57 -31.40 1hr 30m 5cm 1.0 5 3.21 -1.79 -35.80 1hr 30m 5cm % Percentage ...read more.

Conclusion

I am not sure what is the cause of this anomalous result, but there could be several reasons, it could have been measured or weighed incorrectly or all the excess water cold not of been blotted off etc. I think my method is accurate and reliable as I took two readings that both supported my predictions except for only anomalous result and both readings were similar and so were the averages. Looking at this I think my method is reliable if it is repeated accurately. My results were accurate enough to draw up a conclusion that supported my predictions that I made before carrying out the experiment. If I was, given the chance to repeat this experiment I think I could improve it by making sure the potato chips were weighed correctly and I think by soaking the potato chips for longer I would have gathered more accurate results. I would also measure the volume of the sugar solution more accurately because having too much or too little could have affected the osmosis. ?? ?? ?? ?? Siobhan Codner- ...read more.

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