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Rate of Osmosis on Potato Pieces

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Introduction

Biology Experiment Write Up Method During my experiment, I made a few changes to my plans, which were due to the lack of time given. 1. I placed the potato onto a white tile and extracted eighteen cylinders using a size 3 borer. I managed to take out these eighteen cylinders from one potato. 2. Once I removed the eighteen cylinders of potato, I placed them onto the white tile in groups of six. I then cut the individually to 3 cm as 2.5 cm was just too small. By cutting the cylinders individually, I was able to get an accurate measurement. I was still sure to keep no skin on the outside of the potato. 3. I then measured the weight of each of these pieces of potato and recorded the results into a table, which I had pre-made. 4. I then enrolled in the task of filling up the eighteen boiling tubes with the different concentrations of sugar solution. Here is the plan I followed: Boiling Tube One- 100% sugar solution-20ml Boiling Tube Two-80% sugar solution, 20% distilled water-16ml of sugar solution and 4ml of distilled water. Boiling Tube Three-60% sugar solution, 40% distilled water-12ml sugar solution and 8ml of distilled water. Boiling Tube Four- 40% sugar solution, 60% distilled water-8ml sugar solution and 12ml of distilled water. Boiling Tube Five- 20% sugar solution, 80% distilled water- 4ml sugar solution and 16ml of distilled water. ...read more.

Middle

The line of best fit backs up my prediction as generally, as the concentration of water increases, the mass increases showing water has moved into the potato cells when more distilled water is present. My second graph is for the second set of results I took: My second set of data showed that the 100% sugar solution had lost the most mass as the water would move out of the potato cells and into the high sugar concentration. This was as I had expected. I can see that the mass continues at a steady increase. Unexpectedly, the 40% sugar solution contained the highest mass. I would have expected the 100% distilled water to contain the highest mass because there would be more water to move into the cells and less to move out of the cells. My line of best fit shows that as the amount of sugar decreases, the mass increases, which is what I had expected. My third graph was for the final set of results I plotted. The third set of data I took showed that the 100% sugar solution had one of the lowest masses, but the 60% sugar solution contained the lowest. This was unexpected because I would have thought that a lower sugar solution and a higher water concentration would mean a higher mass as the water would slowly move into the cells. ...read more.

Conclusion

I would need to think of some way to make sure that each potato cylinder was given enough time to dry and the same amount for each. I would also try to ensure I place the different solutions in the boiling tubes more accurately. Perhaps if I had enough time and money, I could use a computer to place an exact measurement of the different liquids. Evaluation Method 1. Place an apple on a white tile and remove 60 cylinders using two different sized borers 2. Cut to 4cm equally 3. Measure weight to 4 decimal places. Repeat for accuracy 4. Record in a table and fill 60 boiling tubes with the different solutions of sugar. Use intervals of 5% 5. Mix boiling tubes for 10 seconds each 6. Measure temperatures of each tube 7. Use a machine to place all the apple cylinders in the test tubes at the same time 8. Wait for 2 hours 9. Remove using machine at exactly the same time and place onto a mat in order 10. Dab at the cylinders 20 times each with paper tissue 11. Weigh each cylinder to 4 decimal places and repeat for accuracy. 12. Find the percentage change I believe that overall my experiment was pretty fair and the only way I could really improve is if I had more time and access to machinery and unlimited funds. Ben Banurji 5AJR Biology Coursework ...read more.

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