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Investigation on osmosis.

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Saturday, 28 April 2007 Osmosis My investigation was on osmosis; the experiment that I planned was to find out the potato, which weighed the heaviest after being put into a beaker filled with a sugar solution and a beaker filled with water. This is my conclusion; before, the potato weighed 2.43 of sugar and 2.43 of water. After 24hours of the potato been in a sugar solution the results changed to be 1.73 of sugar, and 2.86 of water. I have drawn out a table of my results and the differences in weight. Solution 1 = 10 ml of sugar solution Solution 2 = 8.5 ml of sugar solution & 1.5 ml of water Solution 3 = 1.5 ml of sugar solution & 8.5 ml of water Solution 4 = 5 ml of sugar solution & 5 ml of water Solution 5 = 10 ml of water Solution Potato Weight Before Weight After Difference Difference (%) 1 1 2 3 .61 .61 .62 .36 .35 .41 -25 -26 -21 40.9 Loss 42.6 Loss 33.9 Loss 2 4 5 6 .59 .58 .62 .39 .42 .39 -20 -26 -23 33.9 Loss 44.8 Loss 37.1 Loss 3 7 8 9 .56 .56 .58 .67 .67 .64 11 11 6 19.6 Gain 19.6 Gain 10.3 Gain 4 10 11 12 .56 .57 .58 .48 .49 .49 8 8 9 16.6 Loss 10.3 Loss 15.5 Loss 5 13 14 15 .63 .60 .60 .84 .84 .89 21 24 29 33.3 Gain 40.0 Gain 48.3 Gain To help me ...read more.


Also testing it three times allowed me to identify any differences that may have occurred and I would have been able to take them into account. Accuracy I have ensured maximum accuracy by using smaller measuring cylinders and making sure not to contaminate all the equipment. Also, and most crucially, I am repeating the experiment 3 times so as to obtain maximum accuracy and then taking the average. Identifying Tends I was able to identify certain trends from the evidence. The pieces of evidence which relay my findings are the graphs I have produced. The one entitled "Average Change in Mass against Concentration". The graph quite clearly shows the relationship of how increasing the concentration of the sugar solution forces the potato to lose more mass. This trend can be summarised as: If you increase the concentration of the sugar solution, the mass of the potato will decrease as well. The graph entitled "Change in Mass against Concentration" makes me think my results were accurate as the 3 lines are very close together. This indicates to me that I have kept within a good accurate and consistent level. From both graphs I am able to find that there is no directly or indirectly proportional link to the loss of mass and sugar solution, but there is a relationship that as you increase the concentration the amount of mass change increases. I did however notice that in the middle of the graph the line was straight, but it started to tail off towards the extremities of the concentrations used. ...read more.


This allows for any remainder of liquid left in the cylinder after pouring. Also a major factor was the cutting. I could have easily left a larger surface area on one than the other. Therefore one would be at an advantage as a larger surface area induces more osmosis to occur. One way to avoid this would be to use complicated machinery to weigh and cut the potato; although beneficial, this wasn't practical, so just taking extra time and care with the cutting would make it more accurate. I did test a wide range of concentrations - this made me able to obtain a more accurate result. I could also experiment with exposing the same weight pieces, but with different surface areas. This would be interesting to do, as I could imagine the results would be ever so different. If I was to repeat the experiment again then I would go to a higher concentration to see what happens in relation to this experiment, and see exactly how much osmosis is able to occur. If I did more varied concentrations by adding as much sugar solution; the reason for this is I feel it would provide me with more accurate results to base my graph and theories on. Also I would like to see how the surface area would affect osmosis, for the reason this is, I feel that it would be interesting to know what affect it has and to compare it to the other set of results I obtained. Lauren Lewis 10Hv. Osmosis Science Coursework ...read more.

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