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Osmosis Experiment

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Prediction I think the potato tubes will swell in the distilled water because there is a higher concentration in the beaker than in the potato. The potato tubes will be longer and wider. In the 0.25 M solution, the potato tubes will swell less because it is less concentrated (in terms of water) in this beaker. In the 0.5 M solution, the potato tubes might stay the same or shrink a little bit. This is because the concentration of water might be a little lower or of the same as that of the potato tubes. The potato tubes will definitely shrink in the 1 M solution. The length will decrease and so will the width. Method 1. Make potato tubes out of a potato using a cork borer: two for each solution, eight in total. 2. Get four little beakers and fill them with various solutions. Measure the solutions (e.g. to about 40 ml) with a measuring cylinder to make sure the values are accurate. The four different solutions are: distilled water, 0.25 M solution, 0.5 M solution and 1.0 M solution. ...read more.


Apparatus potato cork borer 4 little beakers measuring cylinder weight balance ruler Conclusion The majority of my resulted fitted with my prediction at the beginning. In distilled water, the potato tubes did swell. They increased in volume and mass as shown in the results table above (0.44 more cm� and 0.385 more grams). This was because there was a higher concentration of water in the beaker than there was in the potato tubes; and thus water molecules traveled down the concentration gradient. At the beginning, I thought that the potato tubes would expand a little bit in the 0.25 M solution. The change in mass supported my prediction (an increase of 0.065 grams), however the change in volume did not (a decrease of 0.04 cm�). Looking at the figures of the volume and mass of the potato tubes before and after the experiment for this section, we can tell that there was a very little change. So we can say that the concentrations of water in the beaker and inside the potato tubes were roughly the same and there was not much osmosis. ...read more.


Similarly, the potato tubes shrank when water left them. They had become flaccid. That is when there is a short supply of water in the cell, the vacuole collapses, and so there is nothing to push against cell wall. The cell looks floppy and it feels very soft. The potato tubes in the 0.5 M and 1.0 M solutions felt really soft when we took them out. This is a very good experiment on osmosis. However, if I were to do it again, I would make a few changes. There is a little problem with the results I got for the 0.25 M solution. Next time, I will make more accurate measurements. Also, for each pair of potato tubes that I put in each beaker, I have marked them by making one shorter; but when I was doing the results table, I found that it did not matter because I was only finding the average of the two values. So next time, I won't do that. Overall, I think I did quite well for the experiment. The results I got fit with most of my predictions. And through this experiment, I understood osmosis better. ...read more.

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