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The aim of this investigation is to investigate whether or not different concentrations of sucrose solutions would cause a partially permeable membrane

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Introduction

Osmosis Investigation Aim: The aim of this investigation is to investigate whether or not different concentrations of sucrose solutions would cause a partially permeable membrane (in this case a potato chip) to become larger or smaller. I plan to use six different concentrations of sucrose (0.1, 0.2, 0.3, 0.4, 0.5) and distilled water. For each concentration I will be taking down five results and using an average, I will come to the conclusion of how the length of the potato chip has been affected. Prediction: I predict that in water, the length of the potato will increase. I also predict that the more dilute the solution of sucrose the more the potato will increase. The higher the concentration gets, the more the length of the potato will decrease. The theory I have based my prediction on is known as the 'osmosis' theory. The osmosis theory states that movement of water will be from a large dilute solution to a smaller concentrated one. The process will take place through a semi-permeable membrane. ...read more.

Middle

By going from beaker to beaker, I measured the length of the potato and compared it to the original 2cm length. Whilst doing this I plotted the data/information in a table. To ensure that my experiment was a fair test I ensured that the length of each potato chip was 2cm exactly. I also ensured that there were five pieces of potato put in each beaker and that there was 20ml of each solution. The test wasn't repeated and to speed the process up I actually put all five pieces in each beaker at the same time. I used the Internet as a source of information in order to fully describe the osmosis theory. Results: Length Of Potato Chip Against Solution Solution Length Of Potato After 24 Hours (in centimetres) Average Length (in centimetres) Chip 1 Chip 2 Chip 3 Chip 4 Chip 5 0.5 Sucrose 1.9 1.8 1.7 1.9 1.5 1.94 0.4 Sucrose 2 2.1 2 2.2 2.1 2.08 0.3 Sucrose 2 2.1 2 2 2.1 2.04 0.2 Sucrose 2.2 2.1 2.2 2.1 2.2 2.16 0.1 Sucrose 2.4 2 2.4 2.2 2 2.2 Distilled Water ...read more.

Conclusion

My results suggest to me exactly what I thought they would in my prediction, which was that the length of potato would increase in a dilute solution and decrease in a concentrated solution. Evaluation: I thought that the experiment was very successful as I received a large quantity of fairly accurate results. From these results I was able to draw up a somewhat informative graph. I think using five potato chips per beaker was enough and I also ensured that my experiment was conducted using a fair test so I cannot explain the anomalous result that I got. My results support my conclusion as well as my prediction and the diluted solutions increased just as I said they would. I could have improved and extended my investigation by using more potato chips. I used five per solution and had I used more my results would have been more accurate. My method was slightly wrong in a way because I may have checked thoroughly that the length of each chip was exactly 2cm, I never checked to see the mass. I could also have extended my investigation by noticing the mass change as well as investigating the change of length. Dipan Vadgama 10DH ...read more.

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