Diffusion of a Membrane Essay

730 Words Oct 6th, 2014 3 Pages
Mikayla Moreno Diffusion through a Membrane

Purpose: In this experiment one of the questions asked, is water able to diffuse through a cell membrane. The prediction to this question is that yes the water will be able to diffuse. The next question asked, will glucose be able to diffuse through a cell membrane. The prediction is yes it will be able to diffuse. The next question is will iodine be able to diffuse. Again the prediction is yes it will be able to diffuse. The next question asked was will starch be able to diffuse. The prediction was actually no the starch will not diffuses through a membrane. Finally the last question asked was will the weight of the bag change. The prediction was yes the weight will increase.
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Then after re-weighing the bag the weight of it decreased from 13.8g to 11g so the water was able to diffuse. Once the benedicts test was over the solution did turn orange so there was sugar/glucose present. Finally the last thing was to look at the color of the iodine/water. The color did not change so therefore the starch did not diffuse.
Conclusion:
The results of the experiment were both supporting and not supporting all of the hypotheses. The hypothesis supports that water will be able to diffuse, but the weight of the membrane decreased not increased. The next hypothesis supported was that glucose was able to diffuse. When performing the benedicts test the solution did turn orange so that proved there was sugar. The next hypothesis was iodine was able to diffuse. That was supported because the color of the tube changed color. The next hypothesis was that starch was not able to diffuse. That was also supported because the color of the iodine in the beaker did not change colors. Finally the last hypothesis was that the weight of the tube will increase. That was not supported because the weight of the tube actually decreased.
Analysis:
1. No, there was no evidence of starch in the beaker because the color of the beaker did not change color. 2. When applying step 11 the color of the bag changed from a grayish white to a purple. In step 12, when

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