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In this Sc-1 experiment, we are going to put potato chips into different concentrations of sucrose solution, contained in high-density polystyrene cups, to find out how the concentrations of solutions affect the uptake of water by plants.

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Introduction

Planning In this Sc-1 experiment, we are going to put potato chips into different concentrations of sucrose solution, contained in high-density polystyrene cups, to find out how the concentrations of solutions affect the uptake of water by plants. These are what we are given for this experiment: * Potato chips * 1x tray * Max. 15x plastic cups * Sucrose solution (1M) * Beakers, cylinders and syringes * Knives * Chip extruder These are the procedures of my experiment: 1. Cut chips into identical shapes; 2. Mark details onto my plastic cups; 3. Make solutions with different concentration of sucrose; 4. Weigh chips; 5. Place chips into the cups; 6. Take readings at set occasions; 7. Plot results onto a graph; 8. Draw conclusion. Background knowledge & Prediction This experiment will require some basic knowledge on osmosis - the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. As a prediction, using some knowledge based on what I know about osmosis: the higher the concentration of sucrose in the solution is, the lower the mass of chips will get, since water in the vacuoles of the potato cells will move into the solution where the concentration of water is lower; the lower the concentration of sucrose, the higher the mass of chips will get as the water from the solution moves into the vacuoles of the potato cells where the concentration of water is lower. This has been proved by three previous experiments that we have done in the earlier months: the egg and syrup experiment - the egg shrunk in the golden syrup because the water moved from the inside of the egg to the syrup where there was a lower concentration of water; the visking tubing experiment - water entered the visking tubing filled with sugar solution where there was a lower concentration of water; and the red onion cells experiment - the red onion tissue in the water became turgid because there was a lower concentration of water in the red onion cells. ...read more.

Middle

3.40 3.41 2.87 2.89 2.47 2.42 2.08 2.19 1.89 1.80 -1.61 -47.2 3.45 2.91 2.43 2.23 1.68 3.39 2.88 2.37 2.27 1.83 Mean of Set 1 and Set 2 Concentration % of Sucrose Mass of Potato Chips (g) Overall Change of Mean (g) Change % After 0 hrs After 1 hrs After 3 hrs After 5 hrs After 24 hrs Avg. Mass of Chips from Set 1 and Set 2 Mean Avg. Mass of Chips from Set 1 and Set 2 Mean Avg. Mass of Chips from Set 1 and Set 2 Mean Avg. Mass of Chips from Set 1 and Set 2 Mean Avg. Mass of Chips from Set 1 and Set 2 Mean 0% (Water) 3.17 3.18 3.53 3.53 3.80 3.80 3.82 3.84 4.00 3.98 0.80 25.2 3.18 3.52 3.79 3.86 3.95 20% 3.19 3.18 3.41 3.42 3.61 3.62 3.63 3.64 3.70 3.71 0.53 16.7 3.17 3.42 3.63 3.65 3.72 40% 3.31 3.31 3.34 3.34 3.31 3.31 3.29 3.33 3.27 3.32 0.01 0.302 3.30 3.33 3.31 3.36 3.37 50% 3.27 3.25 3.19 3.18 2.98 2.99 2.94 2.96 2.77 2.83 -0.42 -12.9 3.23 3.16 2.99 2.97 2.89 60% 3.30 3.30 3.16 3.14 2.87 2.85 2.79 2.75 2.60 2.55 -0.75 -22.7 3.29 3.11 2.83 2.70 2.50 80% 3.15 3.25 2.87 2.92 2.45 2.54 2.34 2.41 2.16 2.22 -1.03 -31.7 3.34 2.97 2.62 2.48 2.27 100% (1M) 3.28 3.35 2.92 2.91 2.41 2.42 2.27 2.23 2.04 1.92 -1.43 -47.5 3.41 2.89 2.42 2.19 1.80 Analysing In my "mass change % against concentration of sucrose solution" graphs, I have found out that the chips in sucrose solutions with a concentration below about 40% ended up having increased masses; chips in sucrose solutions with a concentration above about 40% ended up having decreased masses. The graph shows that the mass change % decreases as the concentration of sucrose solution increases, i.e. the chips gains less mass or loses more mass as the concentration of sucrose solution increases. ...read more.

Conclusion

Apart from that, I am fairly pleased with my results, especially with the repeats that I have done and the mean of the results that I have taken. If I have more time I would do more repeats - maybe two or three more, and also I will extend the concentration of sucrose solutions to 150% so that the pattern of the graph can be seen clearer. I'm also pleased about how this investigation has reminded me of something that I have missed in my prediction, and now I've kept it in my mind. What I am really interested after this investigation is what the water concentration is in the potato chips. In this experiment I found out that the mass of the chips that has been in the sucrose solution with a concentration of 40% didn't change much over the 24 hours period. The mass change % against solution concentration graphs showed that the mass change of the chips stayed unchanged when they are soaked in solutions that have a concentration of around 35% to 40%, so if I do this whole experiment again, but this time with sucrose solutions with concentrations of between 35% and 40%, starting from 35%, then 36%, 37% 38%, etc. This should then give a graph showing a more precise value of the water concentration of the potato chips. On a mass change against concentration graph, the water concentration of the chips should have the same value of 'X' of the coordinate on where it is intercepting the X axis ('X',0), so the water concentration of the chips should be 'X'%. This would be quite interesting to be found out. ?? ?? ?? ?? Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC 2 1 Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC Richard Lai Biology Sc1 Coursework 05/05/2003 4th Form Fitz WJC ...read more.

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