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To investigate how changing the concentration of sugar solutions affects osmosis in a potato.

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Introduction

SCIENCE INVESTIGATION - AFFECTS OF OSMOSIS ON A POTATO Aim: To investigate how changing the concentration of sugar solutions affects osmosis in a potato. Preliminary Research: Osmosis is the process of diffusion or movement of water particles from a high concentration to a low concentration through a selectively permeable membrane. In this investigation, I am using a potato to see the affects of osmosis. There are various factors, which affect this process of osmosis: > Size of potato - If the potato is of a large size it is likely that it will contain more substances. Therefore, it is likely to contain more water, which can affect the process of osmosis, as there will be an increasing concentration of water as the potato's size increases affecting the overall movement of water if the concentration of the solution in which the potato is in is kept the same. > Weight of potato - The change of weight of a potato has similar affect to the change in size of a potato. If the weight increases, the water content is probably going to increase affecting osmosis. > Concentration of solution - The concentration in which the potato cylinders are put in affect osmosis because there will be different concentrations of water in the solution and in the potato. ...read more.

Middle

Therefore, I also predict that when the potato cylinders are put into the low concentrations of sugar solution it can increase in length from its original size. The graph used in my preliminary work also supports my theory. The length of the potato in the graph decreased as the concentration of sugar solution increased. Fair Testing: This will be a fair test because the factors I have described in my preliminary research will remain the same apart from the factor I am changing; the concentration of the sugar solution. I will do this by cutting the potato cylinders length equally ensuring that they are all the same length and weigh the potato cylinders accurately. I will also vary the sugar concentrations 5 times and repeat the experiment 3 times. Apparatus: Potato Ruler Scales Cork borer Knife Beakers Sugar solution - 4 concentrations: 0.5M, 1.0M, 1.5M, and 2.0M Distilled water Stopwatch Measuring Cylinder Tongs Diagram: Method: > Use the cork borer to cut 15 cylinders of potato. > Cut the cylinders so that they are all the same length, > Weigh and measure the length of one of the potato cylinders and record the result. > Pour 75ml of each concentration of sugar solution into separate beakers. Also, pour 75ml of distilled water into a separate beaker. ...read more.

Conclusion

If we looked at the solutions with a very powerful microscope we would see that the solvent sugar end is weaker than side A. Osmosis is the diffusion of water molecules from a region of higher water concentration to a region of lower concentration through a selectively permeable membrane. It is important to remember that in osmosis, it is only the water molecules that move. Solutes stay in place. Uptakes & Transport of Water in Plants: All cells absorb water by osmosis. The cell membrane in plant and animal cells is a selectively permeable membrane. Plants absorb water from the soil through delicate root hair cells close to the tips of their roots. These cells give a large surface area for the absorption of water. Key Facts: - A solution is a solute dissolved in a solvent. - Osmosis is the diffusion of water molecules from a region of higher water concentration to a region of lower water concentration through a selectively permeable membrane. - Water enters a plant through root hair cells by osmosis. Did You Know? Poisoned by water- Osmosis affects all living things. A man from Scotland was admitted to hospital in a come. Docters discovered that he had drunk too much water. His blood plasma had become dilute. As a result, his brain cells had taken up too much water by osmosis and had started to burst, causing him to pass out. When he woke up he had drunk too much water to swill round a painfull toothache. ...read more.

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