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Sugar Investigation

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Apparatus Beaker 9 Test Tubes Test Tube Holder Potatoes Distilled Water 0.25 M Sugar Solution 0.50 M Sugar Solution 0.75 M Sugar Solution 1.00 M Sugar Solution 1.25 M Sugar Solution 1.50 M Sugar Solution 1.75 M Sugar Solution 2.00 M Sugar Solution Cork Borer Measuring Cylinder Tweezers Test Tube Brush Method * Label 9 boiling tubes: - Distilled Water, 0.25M, 0.50M, 0.75M, 1.00M, 1.25M, 1.50M, 1.75M, and 2.00M, * Put 40ml� of the appropriate solutions into each tube, * Cut 18 circular strips of potato, if possible you should only use 1 potato, this is useful because in all potatoes there is a different kind of starch. * Measure the length of the 18 discs as accurately as you can. (A good way to do this could be by getting a friend to help you, you can hold a ruler to the potatoes and your friend can cut them, or even visa versa) * Now you have got your potatoes ready you can start making your sugar solutions * You are given at the start of the experiment 3 types of solutions: - 1) Distilled Water, 2) 1M Sugar Solution, 3) 2M Sugar Solution. * To make 40mm of Distilled Water, 0.25M, 0.50M, 0.75M, 1.00M, 1.25M, 1.50M, 1.75M, and 2.00M you need to do the following: - Distilled Water- Take a measuring cylinder and place in 40mm of Distilled Water, 0.25- Take a measuring cylinder and place in 10ml of 1M ...read more.


2: Changing weight of the potato samples. To keep these two variables the only variables in the experiment I must: 1: Keep the potato samples the same length (5cm). This is because if one potato sample is 1cm long and one is 6cm long then the 6cm long sample will have a larger surface area and will osmosis much more quickly. 2: Use the same potato. This is because many factors due to the potato may affect the experiment. For example the age, species e.g. King Edward, size and any imperfections in the potato can be kept to a minimum. 3: Stop the evaporation of any of the molar solution. This is because if the sugar solution evaporates past the level of the of the potato then the potato sample will have less surface area in the solution so may osmosis slower. To stop any solution evaporating a foil lid can be placed on top of the test tube. 4: Accurate amount of sugar solution: More Bathing solution may affect the rate of solution. To make the amount of solution placed in the test tube as accurate as possible a syringe will be used to measure out the exact amount needed. 5: Contamination: As each test tube is filled up with the different molar solutions the syringe which would measure the amount of solution placed in the test tube may become contaminated with different moralities. ...read more.


Finally, I could extend the experiment to a more exact level by looking at the potato cylinders under a microscope, and then I would be able to see the cells in greater detail and draw some more observational results. In my opinion the experiment went well. I gained a good set of results and altogether I am pleased with the investigation. The graph obtained from the results has a strong resemblance to the one in the prediction. This suggests that the experiment was fairly accurate. Although 5 repetitions of each concentration are sufficient, there was a possible anomalous result. This part of the investigation would need to be repeated. A possible factor affecting my results is that although the cylinders were taken from the same potato there is no guaranteeing that the density remains the same throughout the potato. Another factor is that the potato from which the cylinders are taken could be abnormal - this could be prevented by amalgamating sets of results, for example of a whole class, where each experimenter used a different potato. I think that five sets of results was a good number. However, I think that in order to improve my results, the last concentration needs to be retaken, as it is an irregular result. Further work could be carried out to include concentrations that increased in 0.1 M rather than 0.2M. This would increase the accuracy and improve the graph. Other investigations could include using different varieties of potato or different plant tissues e.g. carrot. By Aaron Shread 5 A.M.C ...read more.

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