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# I obtained my scientific knowledge from the

Extracts from this document...

Introduction

Osmosis Coursework Introduction I obtained my scientific knowledge from the "AQA science: double award modular." This is an experiment that will explore the osmosis theory To make this experiment safe I will wear goggles to protect my eyes and also will make sure that when using the borer to cut the potato I have a white tile underneath. The experiment will be a fair test as I will keep the weight of the cut potato the same throughout the water and sugar solutions. I will try to keep the potatoes surface area and volume the same. I will make sure that both pieces of potato are placed in their solutions at the same time and pulled out together. I will make the weight of the potatoes the same by using the top pan balance and keeping the weight roughly the same through out the different potatoes. I will measure the potatoes to 2 decimal places (g). I will make sure the experiment is fair by completely submerging both potatoes under their solutions so they all have the same chance of releasing and taking in water or sugar solution. When repeating the experiment to get a more accurate result I will make sure I use the same controls. ...read more.

Middle

In the experiment the water will diffuse from where it's in a high concentration to where it's in a low concentration. The only thing that matters is the concentration of the water (my variable.) The solute molecules (e.g. sugar) can't pass through the membrane. In each case, water moves from where it is in a higher concentration to where it is of a lower concentration along the concentration gradient. Membrane High Concentration of water Lower Concentration of water I have carried out preliminary work on the topic osmosis such as an experiment using dialysis tubing, which acts as the partially permeable membrane. This experiment involves using the dialysis tube with sugar solution in. I placed the dialysis tubing into a 100% pure water solution. The result of this was the tubing swelling up due to the water entering by osmosis. When I placed the dialysis tubing into the concentrated sugar solution it shrivelled up due to water leaving by osmosis. I will place 5 test tubes in a test tube rack. The first test tube had 10ml of pure water. The second had 10ml of solution, 0.5% of it is sugar the rest water. ...read more.

Conclusion

I possible could have been more accurate with the evidence I obtained by repeating the experiment more than 3 times to get a better average from the results. To make the experiment more reliable I would produce potato chips that all had the same surface area to give them the same chance of osmosing in the same time. This procedure would lead to more accurate results. I could also have an assistant to help me remove and place the potatoes in the solutions so that they all had equal amounts of time in their solutions. I can not make my experiment perfect as the are some limitations to my equipment. To obtain more evidence with osmosis I could improve certain addition aspects like the amount of solution in the test tubes, so that you could get results on whether the amount of solution affects the amount of osmosing a potato chip can do. Some potatoes could have more sugar in than others, so to extend my investigation I could produce results on which potatoes have more protein in. I could add additional information about the time it takes for osmosis. I could retrieve information on the time it takes for the potato chips to reach its limiting point that is if there is a limiting point. Jonathan Stocks 10I-26/04/2007, Osmosis Coursework ...read more.

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