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Osmosis - Potato Mass Investigation

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Introduction

Osmosis - Potato Mass Investigation Planning Osmosis is a net movement of a solution's molecules from a region of highly concentrated area to a region of lower concentrated area through a semi-permeable membrane which lets smaller molecules such as water through but doesn't allow bigger molecules like glucose to pass through. The molecules continue to diffuse until the area in which the molecules are found reaches a state of equilibrium. In this investigation, I predict that the lower the concentration of sugar in the solution, the higher the mass of a potato will be. This is because if I place a potato in a high concentration of sugar solution, the water molecules from the pear will diffuse through to a region of high concentration of sugar solution to dilute it. The sugar molecules cannot enter the potato as they are bigger molecules so therefore the pear will have a smaller mass. I will be going to use water (neutral) as part of the investigation as I predict that the potato piece will have a heavier mass, as the high concentration of water in the beaker will travel to a region of a lower concentration of water which is in the potato. In order to find the effect of the activity that occurred during the experiment, I will first record the mass before the potato pieces were placed in the solution and I will record the potato pieces after the osmosis activity so that I can see the percentage change in mass. ...read more.

Middle

from before to after the potato pieces were in the solution for 5 minutes, I have plotted the results on the graph from the Averages table on the other page. The X Axis shows the Concentration of the Solution in Molars, and the Y Axis shows the Percentage of Mass gained or lost. In my opinion, the outlier to these results is the point at where the Concentration of Solution in Molars is 1, there is a too large difference in mass compared to 0.2 to 0.8 Molars of Solution. The Distilled Water point was considered to be an outlier but after testing the experiment twice I have decided to include this data, as Distilled Water could be a large difference to the Solution, but I can see that 0.1 to 0.2 has a gradual slope in the line making it more reliable to include the data for Distilled Water. After drawing the trend line I have found that there is a correlation, it is fairly strong as most of the points are fairly close to the line of best fit, it is a negative correlation and is quite reliable as every point goes from higher to lower (furthest left point to furthest right). So I can say that the higher concentration of the solution, the more mass is lost, meaning there is more Osmotic Activity when the potato pieces are dipped in the solution with a higher concentration of Molar, so above 0.5 M is Hypertonic (Lower water concentration than the Potato Cell) ...read more.

Conclusion

* A Ruler to measure length of potato pieces. * Goggles - Eye protection. In the experiment, each piece of potato was tested one after another; using the same technique every time to keep the test fair, if we didn't there could have been false results from wrong timing of the stopwatch or time between removing the potato from the solution and weighing it etc. There was only one anomalous result in the experiment, this was the point plotted at 1 Molar of Solution on the 1st graph, and this could have been due to mistakes in recording information or carrying out the experiment. To check this anomalous data, it would be more reliable to repeat the experiment several (3 or 4) times to make sure the result is correct, it would give many more versions of the same data and would give confirmation to the correct result because I think I needed to repeat the test more times to make the experiment more successful. But, the error bars show this test is fairly reliable as their ranges were very close together, meaning the test has nearly the same results and it wouldn't need to be repeated many times to get perfect data. I am very confident about the conclusion if have come to, the data I have collected is reliable enough to make this a good experiment for testing Osmosis. So I think that this test would have perfect results if repeated a few more times as it already agrees with the theory of Osmosis and is a great example of a successful Osmosis experiment. ...read more.

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