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Investigate the effect of solution concentration on osmosis

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Investigate the effect of solution concentration on osmosis. Aim The aim of my experiment is to find out the effect of sucrose solution concentration on osmosis in potato cylinders. To do this I will conduct an experiment. Introduction To carry out my experiment, I will place the potato tubes into a solution containing part sucrose and part water. The potato tubes will all be cut out of the potato using a cork borer and will all be cut to the length of 25mm. This will remain constant throughout each experiment. Each of the 5 times I do the experiment, I will increase the concentration of the solution by 0.25 mols/dm�, starting from just water in, going up to 0.25 mols/dm�, 0.50 mols/dm�, 0.75 mols/dm� and finally 1.00 mol/dm�. The solution shall be my variable. The other variables I could have used are: - The temperature of the solution. - The size of the potato cylinders. - The amount of solution. - The time left in the solution. I will test each solution 3 times to reduce any anomalous results. After I have kept the potato tube in the solution for 60 minutes, I will take it out and re-measure it, I will then calculate the average of all three experiments and then calculate the difference between the final average length and the original length. This will allow me to plot a graph and determine the effect of the different concentration of sucrose solution on the potato tube. ...read more.


2. I used the cork borer to cut out a cylinder from the potato. 3. I then measured and cut the potato cylinder using the scalpel and the tile, and then made sure it was 25 mm in length. 4. I put the potato cylinder into the test tube 5. I poured the selected concentration of solution into the test tube using the measuring cylinder and labeled this test tube to avoid confusion. 6. I left the potato cylinder in the solution for 60 minutes; measured using the stopwatch. 7. Whilst waiting, I set out 5 paper towels to dry the potato cylinders, and I drew up a table to record my results in. 8. After 60 minutes, I drained off the solutions into the sink, and placed all the chips onto each paper towel in order of what concentration of solution they were in to avoid any confusion. 9. I dried each potato cylinder. 10. I then measured each cylinder using the ruler and recorded the results in the table. Safety I will make sure I handle the scalpel with care because it is very sharp and could cause a serious injury I accidentally dropped or misplaced. I will also make sure that I move any surrounding hazards in the lab, like bags or coats. I will wear an apron incase any of the solutions spill onto my clothing. Results Molarity of sucrose solution (mols/dm�) ...read more.


If I was to repeat this experiment again, there would be a few things I would change, or add, to increase the accuracy of my final results. As I only had 5 different solution concentrations to use in this experiment (0.00 mols/dm�, 0.25 mols/dm�, 0.50 mols/dm�, 0.75 mols/dm�, 1.00 mol/dm�.) I would use 11 different solution concentrations if I did it again. The solutions would be: Water/0.00 mols/dm�, 0.10 mols/dm�, 0.20 mols/dm�, 0.30 mols/dm�, 0.40 mols/dm�, 0.50 mols/dm�, 0.60 mols/dm�, 0.70 mols/dm�, 0.80 mols/dm�, 0.90 mols/dm�, and 1.00 mol/dm�. This would help to increase the accuracy of my results. As humans can not be 100% accurate as recording data, would have measured the mass of the potato cylinder as well as the length as the mass can be calculated by an electronic scale that is more accurate then I can measure. Another thing I could change if I repeated the experiment is the length of time I kept the potato in the solution as I only kept the potato cylinder in the solution for 60 minutes, but it takes around 24 hours for osmosis to reach its equilibrium. So I would have kept the potato in the solution for 24 hours. Also the use of a burette instead of a measuring cylinder when adding my solutions to the test tube would have increased the accuracy of my experiment. But overall I am pleased with my results. ?? ?? ?? ?? Leon Simmons - 0185 Centre Number - 53617 ...read more.

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