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What is the effect of concentration on Osmosis?

Extracts from this document...

Introduction

Sophie Jones 11P 11X3 Osmosis What is the effect of concentration on Osmosis? Aim: I intent to find out how different concentrations of sucrose solution (molar) will affect the mass of potato chips by the process of Osmosis, if they become larger or smaller. Variables involved: For this experiment I would expect to have three different variables, independent, dependent and fixed variables. Independent variable: (things I will change) In this investigation I will change the concentrations of the sucrose solution. Dependent variable: (things that I will measure) In this experiment I will measure the change the mass of potato chips when it is placed in a sucrose solution of different concentrations. Fixed variable: (things that I will keep the same) In this investigation I will be keeping the same amount of solution placed in the test tubes for each different experiment. I will also be keeping the same potato though out the whole experiment. Equipment: - Sucrose solution (1 molar) - Scales - Cutting board (tile) - Knife - Stop watch/ clock - Potato chips - Test tubes - Test tube rack - Syringe - Distilled water - Ruler - Paper (for drying the potato chips once out of solution) - Measuring cylinder (to hold sucrose solution) - Sticky labels Method: -Set up all equipment. -Stick labels on each test tube and write the concentration which I will have in it. ...read more.

Middle

The more results you have the more accurate you graph will be, so when I come to do my experiment I will repeat it three times. I must also make some labels to label my test tubes with so that the test tubes do not get mixed up. I can also see that there will be some anomalous results, so if I do repeat the experiment, I will get a more reliable average. Also changing the other aspects e.g. such as emptying out all the solutions, after 20 minutes, will hopefully produces less anonymous results. After weighing the potatoes and recording the weight. I will place them into test tubes of containing 20ml of the relevant solution. The Potato chip is left in the solution for 20 minutes. I shall use a clock to time this. Then they will be removed, gently rolled to remove excess solution, and then weighed again to get the weight after the experiment. I will repeat this experiment afterwards three times to get more accurate result. Then I will wash the test tubes and re-use them I must wash them so that no solution is left in them that might change my results I will then remove all the solutions from the test tubes as quickly as I can, and take the potatoes and weight them and record the results. There are will be 3 results per concentration so I can work out an average. ...read more.

Conclusion

The most difficult part of this experiment, I think, 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, even though I did use scales not everyone would come out exactly the same. In my opinion, 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 am quite pleased with my results. Further work could be carried out to include concentrations that increased in 0.1 M rather than irregular interval. This would increase the accuracy and the graph. Other investigations could include using different varieties of potato or different plant tissue such as carrot or apple. Another way of improving the results would have been to leave the experiment running longer, this would have enabled me to find the saturation point (when the potato can no longer take in any more water) and dehydration point (when the potato cannot lose any more water)and therefore get a more accurate result. Finally, I could extend the experiment to a more exact level by looking at the potato cylinders under a microscope, and then I would be able to see the cells in greater detail and draw some more observational results. ...read more.

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