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To see the effect Osmosis has on a potato chip after a certain time in different concentrations of water; these include: distilled water and 0.2M, 0.4M, 0.6M, 0.8M and 1.0M sucrose solutions.

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Introduction

Results Solution Test 1 Test 2 Test 3 Average Difference (g) Mass Before (g) Mass After (g) Difference (g) Mass Before (g) Mass After (g) Difference (g) Mass Before (g) Mass After (g) Difference (g) Distilled Water 1.98 2.43 +0.45 1.61 1.98 +0.37 2.08 2.51 +0.43 +0.417 0.2M sucrose 1.61 1.71 +0.1 1.93 2.05 +0.12 1.51 1.64 +0.13 +0.117 0.4M sucrose 1.81 1.67 -0.14 1.51 1.43 -0.08 1.41 *N/A* N/A -0.073 0.6M sucrose 1.67 1.73 +0.06 2.04 2.08 +0.04 1.81 1.46 -0.35 -0.083 0.8M sucrose 1.66 1.19 -0.47 1.61 1.17 -0.44 1.74 1.27 -0.47 -0.46 1.0M sucrose 1.94 1.39 -0.55 1.53 1.16 -0.37 1.43 1.08 -0.35 -0.423 Investigation to see the effects of Osmosis - Matthew Voss Aim To see the effect Osmosis has on a potato chip after a certain time in different concentrations of water; these include: distilled water and 0.2M, 0.4M, 0.6M, 0.8M and 1.0M sucrose solutions. Prediction Osmosis is defined as the passing of water from a high concentration to a lower one through a semi-permeable layer, in an attempt to try and even out a water concentration. Here is an example of water passing across the concentration gradient: To prove the theory of Osmosis we are using chips of the vegetable potato. Plants naturally have semi-permeable skins to allow the passage of water and each plant cell has a vacuole, which is used to store water. ...read more.

Middle

Then averages all three of the results, this will give a more even picture of what's happening, try and ignore any anomalous results, as they tend to interfere with the averages. This proves that osmosis exists: the passing of water through a semi-permeable layer. Summary In summary I predict that the potatoes exposed to higher concentrations will loose the most water thus decreasing most in mass and those exposed to the lower concentrations will not shrink and may even grow in mass. Here is a diagram to show how the potato's plant cells would react in a high concentration. Analysis of Evidence From my table and my graph I can see that there is a negative correlation in the way that the average difference in mass of the potato chip gets smaller and smaller. The line of best fit on my graph travels negatively down the graph proving there is a correlation between sucrose solution water and change in mass of potato. This means that the higher the molar of sugar concentration in water, the smaller the difference in mass. Even to the extent where the potato chip actually gets smaller in mass than before it was put in the solution. This means that my prediction was correct in the way that I said the potato would grown in low concentrations and shrink in high ones. ...read more.

Conclusion

The electronic scales we used were extremely accurate, recording mass in grams to 2 decimal places. In summary this experiment isn't very accurate compared to it being done in better-controlled conditions, such as a university laboratory. On a whole I think the experiment was suitable as it properly showed how osmosis worked across a concentration gradient (ignoring the anomalous results). In general it would be useful for other science groups to do the same experiment to find evidence of osmosis and I encourage teaches use this experiment as an example. There are several improvements that could be made to the experiment, for example: if I were to do this experiment again I would use more exact equipment, such as burettes for measuring out the solution. I would also design a set time to leave the experiment instead of roughly estimating two days like we had to because of social limitations. To create a more detailed graph I would use more concentrations of water, such as 0.3, 0.5, 0.7, 0.9 as well as the original concentrations. Also I would do higher concentrations as to find the exact point of total saturation of the potato. In summary we managed to prove the existence of osmosis and how it changes under different concentrations. The main idea of this experiment was to prove that water will attempt to even out concentrations of itself to create an equilibrium and I think we did this. ...read more.

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