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The effect of different concentrations of sucrose solutions in potato cells

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Introduction

The effect of different concentrations of sucrose solutions in potato cells Aim: In this experiment I am going to investigate the effect that different concentrations of sucrose solution have on potato cells. Prediction: I predict that the potato cylinder that is immersed in distilled water will increase in size the most out of all the potato cylinders. I think this because, in this solution there will 10ml of pure water, no sucrose, which means the potato can absorb the most possible water through osmosis, there are no molecules that can't be absorbed. Whereas in the other solutions, the sugar molecules won't be able to travel through the potato's membrane because it is semi permeable so through osmosis, only water molecules can diffuse from the higher concentration outside the potato to the lower concentration inside the potato. Method: I will prepare 5 identical potato cylinders each measuring 2cm and 5 test tubes filled with different strengths of sucrose solution. ...read more.

Middle

* 1 ruler to measure the changes in length of the potato cylinders. * 1 measuring cylinder/pipette to measure out 10cm of the solution each time. * 30ml of each concentration of the 5 different sucrose solutions. Possible Variables: These are the possible factors that I could change, which would affect the results of the experiment: Time: the longer the potato cylinders are left in the solutions, the more or less they could decrease/increase in size dependent on the solution they are in. Temperature: is known to affect the rate of reactions and it would also affect the results in this experiment because if the temperature is hotter, osmosis would happen more quickly because the particles would have more energy to move around; meaning the potato cylinder would increase more in size. Solution volume: Obviously if there is more of one solution, there is more water in this case to travel through the semi-permeable membrane of the potato, so it would increase in size more. ...read more.

Conclusion

the same. I was as exact as possible with the timing and made sure I removed all the potato chips after 30 minutes; I measured all the solutions exactly as well as the potato cylinders. Other than temperature, the one factor I think could have been more exact was timing, because after the 30 minutes, it was difficult to remove all 5 potato chips at the exact same time - the last chip I removed would obviously have been in the solution for a bit longer than the first I removed. However this would have only been a very slight difference in time and is unlikely to have affected the results significantly. If I was to do the experiment again, I think I would use potato cylinders of 3cm in length, not 2 and leave them immersed in the solutions for a bit longer, possibly 35 minutes. This would allow more time for osmosis to take place and hopefully produce more differentiated results, because the differences in this experiment's results were only very slight - about 0.1cm Kelly Nash 10P ...read more.

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