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An experiment to investigate the effects of sucrose solution on Osmosis in potatoes chips.

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Introduction

Osmosis Title: An experiment to investigate the effects of sucrose solution on Osmosis in potatoes chips. Aim: The aim of this investigation is to see the effects of osmosis on the mass of potato chips in different concentrations of sucrose solutions. Intro: Osmosis is the diffusion of water molecules from an area of high concentration to and area of low concentration through a selectively-permeable membrane. Cell membranes will allow small molecules like Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through. Cell membranes will not allow larger molecules like Sucrose, Starch, protein, etc. to pass through. Hypertonic solutions contain a high concentration of water on the inside of the cell so therefore water diffuses out of the cell causing it to shrink. Hypotonic solutions are when the concentration of the water surrounding the cell is higher water diffuses into the cell, making it swell up and become turgid. If done with potato cells the cells would increase in length volume and mass because of the extra water. Isotonic solutions contain the same concentration of water inside and outside the cell so therefore the cell neither losses nor gains water by osmosis. ...read more.

Middle

- to cut out potato cylinders Method: We did a pre-test which gave us inaccurate results due to the fact that the solutions had been kept in the fridge over a week and because temperature affects the rate of osmosis we had to do another test to get accurate results. We got 6 test tubes, two test tube racks and placed the test tubes inside the test tube rack according to the concentration of the solution. We got a potato and cut 6 cylinders using a potato borer. We then measured all the potato cylinders to 4cm and cut them using a knife and cutting tile. After this we measured the mass of the 6 potato cylinders and write them down on our results table. After each potato cylinder was measured we placed them next to the test tubes. After the potatoes had been measured and weighted we filled the one test tube with distilled water and then the rest in sucrose solution according to the concentration of the solution. We then put the potato cylinders into the solutions in minute intervals to allow all the potatoes to be put into the solutions and the same time, therefore keeping it a fair test. ...read more.

Conclusion

I might also change the producer I used to see if it is more accurate to collect information from a different producer. The method I used to perform the experiment was very simple, which made it easy to perform and collect data from the experiment. However I might decrease the number of people in my group because it is easy to give 2 people 2 jobs each which they could easily get on with, than to have 4 people doing 1 job and getting in each others way which could case inaccurate data. There was only one problem with my experiment which caused me getting inaccurate results. This may have been caused by a group member. When the potato chips were removed from the test tubes and dried I may well have dried some potatoes more thoroughly than others and so some would have more excess water, which would add to the mass. If the experiment was repeated I could find another way to dry the potatoes that would ensure that all were dried in the same way for the same time. However I think that the experiment was truly successful and I was very pleased with the complete comparison of my results with my initial prediction. ...read more.

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