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Osmosis. I predict that the higher the concentration of molar solution, the more the potato chip will weigh.

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Introduction

Sean Sutton Osmosis Coursework Centre Number: 13440 Candidate Number: 0109 Osmosis Introduction: Over the past term we have been studying osmosis and diffusion. It is when you put a strong solution into a weaker solution such as sugar. Osmosis is described as the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. If the solutions on each side are equally concentrated then there will be no movement of water across the membrane. If the solution outside the cell has a low concentration, the cells become affected because water is flowing into them, if the solution outside the cell is of high concentration the water flows out. If two solutions of different concentration are separated by a semi-permeable membrane which is permeable to the smaller solvent molecules but not to the larger solute molecules, then the solvent will tend to diffuse across the membrane from the less concentrated to the more concentrated solution. ...read more.

Middle

Then the starting mass will be measured. To each test tube a cut piece of potato will be added and its mass labeled on paper. These will be left for 5 minutes. Then the potato pieces will be removed, dried by with a paper towel and weighed. The results will then be put into table form. Prediction: For this investigation I predict that the higher the solution, the potato will be higher in mass. I think this because osmosis is a type of diffusion, and the stronger the solution the more the potato chip will absorb. This is because the high water concentration will move across to the low water concentration. Apparatus: 1 Molar sugar solution, distilled water, potato, cork borer, mass balance, boiling tubes, knife, measuring cylinder, stopwatch, paper towels. Method: * I will use one potato for my experiment. ...read more.

Conclusion

For a more accurate result, we could have increased the (M) by 0.1 instead of 0.2. Also, there could have been a variety of plant such as carrot etc. Conclusion: My conclusion is that the higher the solution, the lower the potato chip grew in mass. When there was 0.0 M of sugar solution, the mass of the potato grew a lot, but when a solution was added, the mass always decreased. This is because of the diffusion which takes place in osmosis. If the solution outside the cell has a low concentration, the cells become affected because water is flowing into them, if the solution outside the cell is of high concentration the water flows out. Overall I feel this experiment will help me in my exams because I now understand more about diffusion and osmosis, and what it takes for osmosis to occur. ...read more.

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