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An Investigate on the affect of osmosis on a potato

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Introduction

An Investigate on the affect of osmosis on a potato. Osmosis is a special form of diffusion that involves the movement of water molecules from a place where they are at high concentration to place where they are at low concentration across a partially permeable membrane/ selectively permeable membrane. The aim for my experiment is to see the results of the change of mass when placed in different concentrations of sugar solutions. For my experiment I am going to list the things I am going to keep the same and the things that I am going to change. I am going to call these my variables. This is so my experiment can be the fairest it can be. Variables that I am going to keep the same * I am going to use the same cork borer and I am going to use the same ruler. * I am going to use the same potato. ...read more.

Middle

In the plain water I think that the water is less concentrated in the solution so the less sugar molecules means the more water the potato can take in. Which means the potato, in my opinion will be the largest in mass. I think in the 5ml sugar solution the mass of the potato will decrease in mass as there is a big difference in the concentration gradient therefore the mass will decrease at least enough for us to notice. This is what I hope is going to happen in my experiment. The higher the concentration of water outside the potato the more turgid the potato will become. The lower the concentration of water outside the potato becomes the more placid the potato will become. But I think that part of my prediction will be wrong as there will be a point of equilibrium in the solution and in the potato therefore there will be no change in the potato. ...read more.

Conclusion

5. I will make sure the weighing scale is clean incase other substance react with my sugar solutions. 6. I will not touch the pieces of potato with my hand as it would make it unfair, so I will use the tweezers. I will then weigh each piece of potato just to make sure that they have the same mass. 7. After I have recorded the mass for each piece I will put all the pieces into there specified test tubes at exactly the same time. 8. I will start the timer. 9. After 10 minutes is up I will lay out each of the potato pieces onto a paper towel and then I will lay another paper towel on top of the potato pieces. I will gently dry each of them. 10. Again I will clean the scale and weigh each potato piece separately and I will record the results. 11. I will then clean up all of my work and draw a results table. ...read more.

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