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An investigation on Osmosis to determine the concentration of sugar molecules inside a potato.

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Introduction

An investigation on Osmosis to determine the concentration of sugar molecules inside a potato Plan What is osmosis? Water moves from where it's a high concentration of water to where it's a low concentration of water along a concentration gradient. Aim To investigate the concentration of sugar molecules inside a potato using controlled osmosis. Diagram Method of investigation To determine the concentration of sugar/water solution in potato chips I will place each sample of equal size chip in a solution of sugar and water. Each sample will be placed in a varying concentration of solution in steps 0-1 molars for 10 minutes. I will weigh the potato chip sample before and after it is placed in the solution. I will record my results in a table, analyse them and determine if the results support my prediction. Prediction I predict that when the potato is placed in a weak sugar solution the potato will gain weight. I also predict that when the potato is placed in a strong sugar solution the potato will lose weight. Background Theory for my prediction The water enters the potato by osmosis going from a high concentration to a low concentration along a concentration gradient. ...read more.

Middle

3. AQA science modular double award book. (Pg 24-25). 4. The biology teacher. An investigation on Osmosis to determine the concentration of sugar molecules inside a potato Collecting my data To do all my experiment properly and get accurate results I had to use the right equipment. When I had collected my results I put them into a table. This is shown below. I collected my data carefully and wrote it in my table and I tried to record them clearly so there wasn't any mistakes. I had to repeat one of my results because I had done it wrongly. This result was the first one. Analysing and concluding My Results The readings I will take are the weight before the experiment and the weight after the experiment. This will show if the weight has increased or decreased by osmosis. I will calculate the percentage change in weight of the potato chip (by dividing the difference in weight by the start weight x 100) and draw a graph of the results. I have decided to use percentage change as this will give me comparable data to analyse. mole %age change wt gms before Wt gms after Change in wt 0 6.9 2.9 3.1 0.3 0.1 4.5 4.4 4.6 0.2 0.2 0.0 4.8 4.8 0 0.3 -2.4 4.2 4.1 -0.1 ...read more.

Conclusion

The reading taken at 0.5 moles shows an extreme piece of data shown on the graph as -15%. If I did my experiment again I would take the readings I already have and repeat them twice and take an average of all three readings to make sure my results are reliable and accurate. I think the first of half of my results were accurate but the second half of my results were not as accurate due to the remaining time of the lesson. I felt I had rushed those second results and therefore they look spread out on the graph. I think my results and graph support my prediction and conclusion that: * When the potato is placed in a weak sugar solution the potato will gain weight. * When the potato is placed in a strong sugar solution the potato will lose weight. Additionally my results and conclusion support my scientific ideas that: * In a high concentration of water the water enters the potato by osmosis going from a high concentration to a low concentration along a concentration gradient. * In a low concentration of water the water moves out of the potato by osmosis going against a concentration gradient. * There is no exchange of water when the concentrations of sugar molecules are equal in the potato and sucrose solution. 1 ...read more.

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