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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: Data analysis: From the graph, we can clearly see that the change in length is proportional to the change in weight. As the strength of solution increased, the length and weight increased too from 0.05m to 0.5m. The length and weight decreased when the strength were 1m and 2m. 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...

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