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Investigating Osmosis

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Introduction

Jack Chen 10KM Biology Investigating Osmosis Aim: This experiment is to develop a model for discovering the strength of the sap of potato (its osmotic potential). Table: Sucrose Solution (m) Weight before (g) Weight after (g) Change in weight (g) Length before (mm) Length after (mm) Change in length (mm) 0.05 3.12 4.87 +1.75 30 35 5 0.1 3.15 4.53 +1.38 30 33.5 3.5 0.5 3.16 3.30 +0.14 30 31 1 1 3.23 2.92 -0.31 30 29 -1 2 3.22 2.83 -0.39 30 28 -2 Graph: ...read more.

Middle

I can estimate that the strength of potato is 0.7m. Conclusion: The results proved that my hypothesis was right. The water flow thorough the membrane while sucrose is blocked and unable to pass the membrane. The strength of sucrose in potato is about 7m, therefore if the strength of the sugar solution is bigger than 0.7, the water in potato will move to the sugar solution because water moves from high concentration to concentration, therefore, the weight and strength will be decreased. ...read more.

Conclusion

To overcome that problem, I will have to make the size of potatoes as closer as possible. Everything else went quite well, there were just one or two odd results made. What I did with the odd results is I compared the odd results to the normal results and found out what was wrong, and then changed it. I could improve accuracy by doing more trials; unfortunately, I did not have much time to do more trials. After the experiment, I know more about the term "osmosis" and I found it's quite different to diffusion. ...read more.

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