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Investigation of how and why Osmosis works on potato chips when placed in concentrated and dilute solutions

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Introduction

Osmosis Coursework Planning and Information Osmosis is the diffusion of water molecules from an area of high water concentration to an area of low concentration of water through a partially permeable membrane. It can also be known as the diffusion of water molecules from a dilute solution to a concentrated solution through a partially permeable membrane. The diagram below shows what I have described, as the water molecules are moving from a less solute area to a more solute area of less water. In my experiment I am going to find out the amount of osmosis which takes place in an organism. The organism I am using in my experiment is potato cells, and I am going to use potato chips to test this. I am going to measure the amount of osmosis which takes place by how much the potato gains or looses mass in different concentrations of sugar sucrose solution. My independent variable is the sugar sucrose solution, because I am using different concentrations of this solution in my experiment. My dependent variable is the amount of osmosis which takes place, because it is the variable which I measure as a result of the independent variable. ...read more.

Middle

Conclusion My preliminary experiment shows the following: * It is important to keep the size or surface area of the potato chips the same, and it is good to use a potato cutter to do this. * I should leave the experiment to run for a slightly longer amount of time in my real experiment so that I get better results. * The potato cutter can only cut the potato chips width and diameter so I need to use a knife to cut all the chips to an even length. Prediction In my main experiment I expect more osmosis to occur when there is a higher concentration of sugar sucrose solution. The second highest amount of osmosis will occur in distilled water. In the concentrated sucrose solution the water will move from a high concentration of water molecules (the potato chip) to a low concentration of water molecules (the sucrose solution) and so the chip will loose mass. In distilled water this will happen the other way and so the water is moving from a high concentration of water molecules (the distilled water) to a lower concentration of water molecules (the chip) ...read more.

Conclusion

to the sucrose solution (the area of lower concentration of water molecules). The point marked X on my graph (the point where the line crosses the x access) is where no osmosis occurred, so the potato did not gain or loose mass. This is because it was in the state of equilibrium, where there was an equal amount of water molecules in both the potato and the sugar sucrose solution. This is also known as the isotonic point. The trend my graph shows is that more osmosis occurred in a higher concentrated solution of sucrose solution and that the potato lost weight in a higher concentration while in a concentration of NO sucrose solution (distilled water), my potato chip gained weight. In a higher concentration of sucrose solution osmosis has moved water molecules from an area of higher concentration of water molecules (the potato) to an area of lower concentration of water molecules (the solution). This occurs vice versa when in distilled water. My experiment proved my prediction to be correct because I predicted that the potato would loose weight in a more concentration solution and would gain weight in a less concentrated solution of sugar sucrose solution. Sources of Information: I found the example diagram of osmosis taking place at: http://www.biologycorner.com/resources/osmosis.jpg ?? ?? ?? ?? ...read more.

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