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The effect of osmosis in a potato and how it changes through different molar concentrations of sugar sucrose solution

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Introduction

Sarah Fulford 11AD Biology Coursework Experiment Introduction For our GCSE Biology coursework experiment, we will investigate as a class the effect of osmosis in a potato and how it changes through different molar concentrations of sugar sucrose solution. My main aim in this experiment is to find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sucrose and water. We have done preliminary work on this as a class which will help me with this experiment. For future referance I am going to write about Osmosis as this may help me predict its effects on the potato chips.Osmosis is the movement of water molecules from a partially permiable membrane, from an area of high concentration to an area of low concentration. I already know that Osmosis will occur and depending on the molarity the chips will either increase or decrease in mass and length. The mass and length are also our dependant variables and it is clear that these are highly likley to change during the experiment. We will be provided with potato chips and different molarities of sugar sucrose solution ranging from 0M, 0.2M, 0.4M, 0.6M, 0.8M and finally 1M. ...read more.

Middle

I also know for this that the solutions of these molars will be shorter and lighter in mass. The halfway molar (0.5M) should determine that the results remain similar to what they were at the start because written down the amount of sucrose solution going in remains the same coming out. I predict that the results for the halfway molars 0.5M will be close to what they were at the start but not the same. Obtaining evidence I am going to outline the experiment again first. I put 3 potato chips to each boiling tube, there were 6 tubes in total. Each one had a different concentration of a sucrose solution and the aim of the experiment was to find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sucrose solution as said. After the experiment, I had to dry the potatoes first, so that the water outside the tissue of the potatoes would not alter the weight of what it is supposed to be. I quickly took all of them out, and put them onto a piece of tissue paper, into their own groups as stated. Upon obtaining the results, I reset the balance of the scales so that it would read zero with the plate that the chips would be placed upon on top of it. ...read more.

Conclusion

When we are doing this for one set, writing down the results at the same time, while the other 5 sets are being sufficiently dried, the potato tissue is going to vary for all chips. By doing this we would be concentrating individually on each set of chips rather than trying to finish them all as quickly as possible due to limited lesson time. Experimenting with one set at a time would also lead us to better results as the Osmosis action would have the time to reach its full potential hence indicating how much water can be transferred for each solution. * If more people were in a group, they could be assigned different tasks and would be able to share the workload. * Using a wider range of molar sugar sucrose solutions would help us obtain better and accurate results as we would have a wider range and would be able to check our answers against others. Finally repeating the experiment using a 'trial and improvement' theory would lead to accurate results, especially if done 3 times as it would be clear which set of results were wrong when checked against eachother. In conclusion I think that with the equipment used in this procedure, I think that the experiment turned out to be relatively successful and I am pleased with the results obtained, even the anomalous one as I know now what I can do to improve it. ...read more.

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