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Investigating how osmosis changes density in potato chips

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Introduction

Investigating how osmosis changes density in potato chips Planning: Aim: I am intending to find out how Osmosis effects density of potato Chips. Apparatus and Diagram: * 6 Boiling Tubes * Beaker of Salt * 2 test tube racks * 200ml capacity beaker * Accurate Scales Timer * Stirrer * Cork borer * Accurate ruler in millimetres * Scalpel Safety: There are certain safety aspects to be considered. I am using sharp instruments to cut the potato up. I could easily slip so I will have to use a secure surface and have precision in my cutting. I do not want to damage the schools surfaces, so I will be using a cutting board. I have sensitive skin and because I am dealing with salt water, I will have to wash my hands to make sure it doesn't irritate my skin. Variables: * Length * Weight * Type of potato * Age of potato * Density of Potato - This was the variable I chose to analyse by measuring length and radius, to work out the volume, then dividing the mass by that. ...read more.

Middle

In a solution, which contains a higher concentration of salt, water will move by osmosis from the potato chip into the water. This is because the concentration of water in the potato cells will be higher than the concentration in the test tube. This is because there is a lot of salt in the water, so there is currently more water per cm3 in the potato than in the solution. Therefore, the potato will shrivel up, and water will move by osmosis from the potato cells into the test tube. This will make the chip Flaccid. I predict, that the potato will start of turgid, and as the alt concentration increases in the solution, the potato will gradually become flaccid because of the changing amount of water in the solution. I think that as the solution becomes more concentrated with salt, the density lowers. Method Each chip was cut to the same length and width using the cork borer and a ruler. ...read more.

Conclusion

They show that water will move from areas of high water concentration to low water concentration through a partially permeable membrane. My results show that when the concentration of water in the boiling tube was higher than the concentration of water in the potato cells, water would move by osmosis into the cells of the potato. This proves my prediction, where I predicted that this would happen. I say that my results were accurate enough to prove my prediction. My results are fairly accurate but have a few errors. This could have been changed by keeping all variables the same, e.g measuring temperature. Using more accurate measuring equipment would have improved the experiment. You could take them all out at the same time, however this would not make that much difference to the results. I could improve this investigation by taking result before and after. This would have given me a control section to compare the results to. ...read more.

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