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Investigation to find the effect of Osmosis in a potato cell

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Introduction

Investigation to find the effect of Osmosis in a potato cell P Planning The definition of Osmosis is the diffusion of water at high or low concentration across the membrane of a cell. When you put a plant cell into a liquid containing water one of the three things will happen. 1. If the cell has a lower (sugar) concentration than the liquid it is in the cell will lose water. The cell should become smaller and loose mass. 2. If the cell has a higher (sugar) concentration then the liquid that it is in the potato will gain water. The cell should become larger and have a greater mas. 3. If the cell has a similar concentration than the liquid it is in than it should not loose or gain water. The mass and length should remain the same. Here is a diagram showing 3 potato cells in different concentrations. The three outcomes listed above are shown in each potato cell. The molecular theory of osmosis: If there is more water outside a cell than in water diffuses in. If there is more water inside a cell than out water diffuses out. We can link this up to our investigation, and make a prediction Method: I will carry out five different tests using five different concentrations of sucrose. ...read more.

Middle

O obtaining evidence Results: Table to show the change in mass (g) of the potato when put into different concentrations of sugar (M). Results: Change in length of the potatoes in different concentrations of sugar. A Analysing See graphs next pages. In my results I found out that my prediction that I made are mostly correct: "2.0 molar - the mass and length should both decrease, because there is less water outside the potato than in. 1.5 molar - the length and mass should both decrease, because there is also less water outside the potato than in. 1.0 molar - the length and mass of the potato should stay about the same, because there is about the same amount of water inside the potato than there is outside. 0.5 molar - the mass and length of the potato should increase. This is because there is more water outside than in. 0.0 molar - the mass and length of the potato should increase, this is because there is more water outside than inside." The percentage increase and decrease for the graph was worked out by finding percentage change. I averaged my three sets of results to find an accurate result for the percentage change. Percentage Change =change _ 100 Original can see comparing the two graphs, in my prediction and as a part of my analysis, that my predicted results are the same. ...read more.

Conclusion

- Or perhaps I did not blot the potatoes enough. These things could have gone wrong because there was not a lot of time for measuring the length and mass. I had to move quickly and I was in a great rush to carry out my experiment. I gave up measuring the length because the results did not change like the mass did. I was not able to get an accurate result. My results are firm enough to support one conclusion: The molecular theory of osmosis: If there is more water outside a cell than in water diffuses in. If there is more water inside a cell than out water diffuses out. What would I do to improve my experiment? To improve my experiment I would take more time to do my work and ensure that I took my reading at exactly 10, 20, 30 min. I would not measure change in length, I was unable to get results which would give me detailed results. Though my results did agree with my prediction. I could look under a micro-scope and count cells and see what shape they become at different times while being inside the concentrations. In a further experiment I could Look at a different fruit/vegetable to see if I could get different readings, or even use an egg. I could later Investigate whether the change in mass differs from each part of the potato, would it effect my results? ...read more.

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