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An investigation into what effect a sugar solution has on the mass of potato tissue

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Introduction

AN INVESTIGATION INTO WHAT EFFECT A SUGAR SOLUTION HAS ON THE MASS OF POTATO TISSUE Introduction I am trying to find out what affect a sugar solution has on the mass of potato tissue. Hopefully, as I do the experiment I will see osmosis in action. Osmosis is when nature tries to keep things in balance with each other by allowing water alone to pass through a semi-permeable membrane. When there is a higher concentration of water on one side of the membrane then osmosis takes place. This means there is a concentration gradient of water. Osmosis is a type of diffusion. Variables and Fair Testing The only variable I will be investigating is the concentration of the sugar solution. I need to make sure that all the other variables are kept the same to make sure it is a fair test. * Mass of potato I must make sure that I keep each mass of potato to the nearest gram so as to make sure there is no more water in it that there is in the others. If the mass is bigger and there is more water in the potato this would make my test unfair and upset my results. This is one of the most important variables. To ensure it is a fair test I will cut the potatoes evenly and make sure they are the same length to the nearest millimeter. ...read more.

Middle

The membrane does not allow through large particles, for example sugar. Results First Test Time (mins) Weight for: 2 molar sugar solution (g) Weight for: 1.5molar s.s (g) Weight for: 1 molar s.s, (g) Weight for: 0.5molar s.s, (g) Weight for: water (g) 0 1.44 1.45 1.44 1.43 1.43 5 1.37 1.36 1.44 1.43 1.51 10 1.28 1.27 1.44 1.44 1.56 15 1.19 1.19 1.45 1.45 1.58 20 1.15 1.17 1.44 1.47 1.59 25 1.13 1.05 1.45 1.50 1.60 Increase/ Decrease -0.31 -0.4 0.01 0.07 0.17 Second Test Time (mins) Weight for 2 molar sugar solution (g) Weight for 1.5molar s.s (g) Weight for 1 molar s.s (g) Weight for 0.5 molar s.s (g) Weight for Water (g) 0 1.43 1.45 1.43 1.44 1.46 5 1.36 1.38 1.44 1.45 1.5 10 1.27 1.26 1.44 1.46 1.55 15 1.2 1.21 1.43 1.46 1.59 20 1.15 1.17 1.43 1.48 1.6 25 1.12 1.05 1.44 1.51 1.62 Increase/ Decrease -0.31 -0.4 0.01 0.07 0.16 Analysis & Conclusion From my graph I can see that as the amount of water increased the amount of osmosis taking place increased. The 2 molar sugar solution produced quite a high decrease in the weight of the potato, as did the 1.5 molar sugar solution. The 1.5 molar solution decreased more than I expected. The increase in then weight of the potato was very slight for the 1 molar although I expected there to be no change. ...read more.

Conclusion

Also when we stopped the timer to weigh the potato after each 5 mins interval they could not be taken out at exactly the same time so some had a little more chance for osmosis to take place, which would have made it a little bit unfair. I think it would have been useful to have used a sharper knife as sometimes when we cutting the potato we had to saw a little making the end jagged instead of straight. Next I think I will also try using a cleaner measuring cylinder as the one I used was quite dirty so you could not quite see if your liquid was in the exact right place. Apart from these problems I think that my procedure was suitable and worked quite well and fluently. I think that my results were quite reliable as they did follow the expected trend despite one of them going over the expected trend! There was only one anomalous result and even this was not very far out. The repeated results gave almost exactly the same results that I was very proud of. There was definitely a wide enough range of results to be able to analyse them well and thoroughly. I think that to improve the reliability of my results I would have to measure everything much more accurately. A good variable to investigate related to this would be the amount of solution as this would help me to see what happened with my anomalous result. * Word count: 2,544 * Sources: www.essaybank.com Biology revision guide ...read more.

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