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Find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller.

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Introduction

Introduction I intend to find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller. I plan to use six different concentrations of sucrose solution and for each concentration I will take three results. I will then find the percentage change for each result. Finally I will find the average weight change and the average percentage change. * Equipment * 150ml beaker * Ruler * Scalpel * Small cutting board. * Core borer * Sticky labels * Sucrose solution * Measuring cylinder (100cm3) * Stop clock * Test tube * Test tube holder * Mass machine Safety In our experiment we used a variety of equipment. Some of which were quite dangerous. For example we used the razors to cut the potato cells into shape so we had to be extra careful not to cut ourselves. We were in the presence of glass and ceramic so we had to be careful not to break anything. Fair test To create a fair test certain aspects of the experiment will have to be kept the same whilst one key variable is changed. ...read more.

Middle

So the water molecules concealed within the potato moved to the area of higher concentration (the sucrose in the solution) So if I put another piece of potato cell in a more diluted sucrose solution, (for example 75% water and 25% sucrose), it is very likely that the potato will increase in mass because the water molecules in the potato cell will diffuse into the cell making it grow. And if we put it in a more concentrated sucrose solution (for example 25% water and 75% sucrose) it is likely that it will reduce in size and decrease in length because the water molecules in the potato cell will diffuse into the concentrated solution. I can justify my prediction because when we placed the potato cell in 100% water for 10 minutes, the mass increased. When we put the same pieces into diluted sucrose and water, equally balanced in the experiment, the mass remained the same. However when I put the potato piece in concentrated sucrose its mass decreased. my graph shows the line of best fit for the average weights of potato chips before and after Osmosis in different concentrations of sucrose solution. ...read more.

Conclusion

Evaluation In my opinion the experiment was very successful. I obtained a large quantity of quite accurate results. I was able, from these results, to draw up a somewhat informative graph. I think I took enough results for the amounts of concentrations I was using. I also think that I gave the experiment ample time for Osmosis to occur. Maybe if I were to repeat the experiments again I would probably try using a wider range of concentrations as to find a wider range of more varied results. The most difficult part of this experiment, in my opinion, was the accurate cutting of the potatoes. It was very difficult to accurately cut the potatoes to the same length and to get them all to the same weight. To get more accurate results I could have used a scale to measure, instead of 0.0g, 0.00g. In my opinion, there were not many of my results, which were out of the ordinary. Slight differences may have been the result of human hands drying each, some more thoroughly than others. This could mean that some would have had more excess water than others, resulting in an increased mass. However, I think that my experiment was successful and I am quite pleased with my results. ...read more.

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