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Osmosis in Potato cells

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Introduction

Henry Pearman Osmosis in Potato cells Plan There are many different variables in this experiment that could be changed. These are the variables, which would have an effect on the experiment: Temperature because this could vary the speed of the osmosis, the enzymes could increase or decrease. Size of the chips because this would make it an unfair experiment because some of the potato chips would have to take in more solution than the others They all have to be the same size to make it a fair experiment. Volume of Liquid because this would make it an unfair test because some of the chips could have more solution to take in than the others so they would increase in there size more. Time because this would make it an unfair test because if some of the potato chips were given more time in the solution than some of the others then osmosis would occur more in these potato chips than the others ones which had a shorter time in the liquid. Concentration of the solution because the more concentrated the solution the more the potato chips will shrink because there is more water inside the chips rather than outside in the solution. Method for Trial Run The equipment I am going to use in the trial run is: > 5 Boiling Tubes > Knife > Tile > Test ...read more.

Middle

Place the beakers near a window so they can get natural light, we left our beakers there for 94 hours to see what would happen to them. Safety in the experiment: > When pealing the potato cut away from yourself. > Keep fingers away from the knife. > Wash hands after using the solutions. Prediction. I think that the potato chips in the water will increase in size the most because the water is a dilute solution and the enzymes will travel through the potatoes semi-permeable membrane to a higher concentration, so the potato chip should increase in size. I also think that the longer I leave the potato chips in the solutions then the more they will increase in size. I predict that the more concentrated the solution then the more the potato chips will decrease in size because there will be more sugar molecules and they will not be able to pass through the semi-permeable membrane of the potato chips instead they will decrease in size because the water will leave the potato chips and go into the solution the chips is in. Henry Pearman Analysis and Conclusion The pattern I see is that the higher the concentration, the more the potato chips decrease in size and the lower the concentration the more the potato chips will increase in size. ...read more.

Conclusion

I could have checked accurately that there was no trace of other substances or solutions on the beakers or measuring cylinder I used. Henry Pearman There is one result which I think could be a bit anomalous and that is the 0.5m solution because I didn't expect in to decrease in weight as much as I did I thought it would only have decrease a slight bit but there was quite a big decrease. I think that the solution could have been a bit higher concentration than 0.5 m so then the potato chips would decrease in weight more. I think I have good enough results to be certain of my conclusion apart from the 0.5m. They are good enough because there is a steady curve on the graph and the points are not very far away from each other at the intervals. The 2 potato chips in each solution are not very far away from each other in the results; there is never more than 0.2g between each result, which I think is quite accurate for my results. I think I could have done a few more trail runs at the start than I did so I could be certain that my experiment was going to work out well and I could change any variables before the main experiment. I think I could have done some more accurate measurements at the start like measuring all angels of the potato so the results would have been very accurate. ...read more.

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