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To investigate how the concentration of a sucrose solution affects the length of a potato chip. The length will be measured after 24 hours.

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Introduction

Osmosis Investigation Aim: To investigate how the concentration of a sucrose solution affects the length of a potato chip. The length will be measured after 24 hours. Prediction: In this particular experiment, I think the lower the concentration of the sucrose in the test tube the greater the length of the potato, because of the potato tissues being surrounded by a weak solution, will be most likely to swell up and become turgid, taking in all the water it can possibly take in. However this can work vice versa, because as you increase the sucrose concentration then the potato length will decrease, this is due to the potato tissues being surrounded by a stronger solution therefore the water diffusing out of the potato into the solution. I have predicted this following a scientific theory. This theory is the movement theory, which states that movement of water (H20) from a dilute solution to a concentrated solution, through a semi-permeable membrane. Osmosis is defined as the net movement of water or any other solution's molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. ...read more.

Middle

If this experiment isn't a fair test, we will be obtaining the wrong results, which could lead us to the wrong conclusions. First of all, and most importantly, we will have to get the measurements of the potatoes and the measurements of the solutions right. We will try and get the measurements of the potatoes as accurate as possible for every single potato, evenly cutting the potato pieces 2cm per piece. But I believe one of the most important steps in the fair testing is to make sure that the potato is fully covered by the solution. This is because the potato should fully submerge, by having total contact with the solution. Getting and experimenting with the exact measurements of molars and water is vital to this task. If the volume of one solution in a test tube is higher or lower than another, will affect the pattern of results later on. Small things such as a dirty test tube, and a slightly cracked measuring cylinder could still affect the results, and therefore we will take these into account as well. I couldn't repeat this exercise due to not having enough time but I made sure that I compared my results with other groups doing this experiment so I could get a wider view of the out comings. ...read more.

Conclusion

A problem with my method could be that I didn't repeat the exercise enough times to get more reliable results. I think that my observations and measurements were not the best because I was underneath a certain time limit to get the experiment done, the variations in length would have been at maximum 2mm. There were four anomalous results that didn't go through the line this was due to me not cutting the potatoes to the exact size. Also because all the potatoes were not of the same mass. To make this experiment better, I believe that we could have done one test at a time. Using more types of molar sucrose solutions would have helped us obtain better results, and more accurate results, so that we can make sure the results are totally correct. Experimenting with one set for a longer period of time, for each set, would lead us to better results, because the osmosis action would reach its maximum capability, and therefore tell us how much water could be transferred for each solution. I could have extended my investigation by doing more research on osmosis and by spending more time on the actual experiment. Overall I was pleased that my prediction was right although getting a few anomalous results due to human fault, however my results still supported my prediction and I came to my conclusion. ...read more.

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