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Osmosis Investigation

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Osmosis Investigation Plan In this experiment I will be seeing how the strength of a glucose solution effect the size, mass and volume of a potato chip. I aim to conduct a fair test by making sure that the potato chips are the same length and mass, making sure that the potatoes are all the same types because some may have a different reaction to others. This could be due to different genetic structures within the potato, so if you use one Varity of potato the cells may have larger storing capabilities than another variety. Also some potatoes may have more cells than others so there will be bigger changes due to osmosis, that is why I will use the same variety of potato. The potatoes stay in the solution the same length of time. This is because the longer they stay in the more osmosis will take place. So if you left some in for only 30 minutes and some in for an hour, the ones that have been in for an hour will have had a larger change because osmosis will have been taking place for a longer period of time. By making sure I use the same measuring and weighing equipment and by making sure that the temperature and light intensity are the same for each experiment, temperature if high could make the potatoes dry up and make the water evaporate, this would lead to misleading and anomalous results. ...read more.


Diagram of set up ???????????????????????????????????????????????????????????? ???????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????Sugar solution ?????????????potatoe chip ? Prediction I predict that the potatoes in the solutions with the highest glucose content will shrink and lose weight and that the potatoes in the weakest solutions will gain weight and increase in size. The ones in the solution where the sugar and water content is the same as the potatoes sugar and water content will not increase or decrease in size and will not increase or decrease in weight. I think this is because of a process that takes in the potato place called osmosis. This is when water molecules diffuse from a dilute solution into a concentrate solution through a semi permeable membrane. So if you put a potato chip in a solution which has a concentration of X. If you put a potato in a solution, which was less than x the potato would grow because there will movement in the water from the weak outside into the potato, this will give the appearance of growth. However if you put a potato in a solution 3 times stronger than x the water will move out of the cell to the surrounding solution to try and dilute it. This will make the potato shrink. If you put a potato in a solution with strength of x there would be no movement because the strength inside the cells is the same as outside the cells. ...read more.


* Inaccurate measuring of time. * Using different potato types, which have different genetics. However my results were accurate enough to draw a firm conclusion. We did this experiment to see how differing strengths of glucose solution effect a potato chip of a specified size and length. We did this to observe the changes in mass and size and to see if osmosis takes place. If I were to do the experiment again I would make some changes. I would use more accurate measuring equipment. I would use calipers to measure the size of the potato; this would make it accurate to millimeters depending on the accuracy of them. This more accurate measuring equipment would make a more accurate mass calculation so then the percentage change would be more accurate, meaning the results would be more accurate. I would also perform the experiment in a temperature and light intensity controlled room, this would prevent changes in both of these. The changes could cause the cell work rate to rise or drop also it could cause the water and sugar molecules to speed up movement which could effect osmosis. I would also leave the chips in the solutions for a longer period time, as 1/2 and hour isn't long enough to see big changes, the recommended minimum time is a hour. I would also use a wider strength of solutions; this would then give a wider range of results, which in turn will make the experiment more accurate. If I were going to change the experiment I would see how different light intensities and how different temperatures effected the rate of osmosis in a potato chip. ...read more.

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