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An Experiment to find out the Molarity of Sugar Solution Inside Potato Cells

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Introduction

Jack Holmes An Experiment to find out the Molarity of Sugar Solution Inside Potato Cells Background Information Osmosis Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. Semi- permeable membranes are very thin materials which only allow certain things to pass through them. They will allow small molecules like Oxygen, water and Carbon Dioxide to pass through. Water molecules can pass across the cell membrane in both directions. Cell membranes will not allow larger molecules to pass through them though like sugar or protein. Osmosis occurs when you put an animal or plant cell into liquid containing water. If the medium surrounding the cell has a higher water concentration than the cell the cell will gain water by osmosis. ...read more.

Middle

* Volume of sugar solution (150ml) * Time (2 days) Prediction From my background knowledge I predict that as the molarity of sugar increases, the mass of potato will decrease. This will happen because osmosis will take place. As the molarity of sugar solutions increases, the concentrations of water molecules is reduced, so water molecules will move out of the potato into solution. This will cause a decrease in mass. In a weak solution of sugar the mass of the potato will increase. Results (class results) Concentration of Sugar Solution (ml) Mass at Start (g) 1 Mass at Start (g) 2 Mass at End (g) 1 Mass at End (g) 2 Change in Mass (g) 1 Change in Mass (g) 2 Average (g) 0.0 40 30.8 45.78 43.9 +5.78 +13.1 9.41 0.1 26.17 15.6 31.56 20.68 +5.39 +5.01 5.2 0.2 31.5 36.5 41.72 68.7 +10.22 +32.2 ...read more.

Conclusion

From my results I have been able to make decisions about my prediction. When conducting this experiment, I found that it was hard to dry the chips of potato, and it was quite difficult to get all the pieces the same size. Also, we had to leave the potato in the solution for two days rather than two hours and this affected our results. Our group had a few anomalies so we repeated the 0.2M sugar solution. We used the same shape and the same size potato chip to make it a fair test. We need to try and find the real results as we didn't think that we dried the potatoes properly. This would create the anomaly. If I ever do this experiment again, I would make sure all the potato chips were dried properly and that they were the same each time, this would decrease the amount of anomalies. ...read more.

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