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An investigation into the affects of a Sucrose solution on potato chips.

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Introduction

An investigation into the affects of a Sucrose solution on potato chips Aims of the Experiment The aim of this experiment is to see how a potato changes in size when placed in different dilution concentrations of sucrose and water. With this we aim to see the affects of Osmosis in the potato chip. Background Information (Research) Osmosis Osmosis is the special name to describe the diffusion of water across a membrane, from a dilute solution to a more concentrated solution. In biology this usually means the diffusion of water into and out of a cell. Osmosis is only one special type of diffusion because it is only water molecules and their movement that we are considering. Osmosis, the spontaneous passage or diffusion of water or other solvents through a semi permeable membrane (one that blocks the passage of dissolved substances--i.e., solutes). The process, important in biology, was first thoroughly studied in 1877 by a German plant physiologist, Wilhelm Pfeiffer. Earlier workers had made less accurate studies of leaky membranes (e.g., animal bladders) and the passage through them in opposite directions of water and escaping substances. The general term osmose (now osmosis) was introduced in 1854 by a British chemist, Thomas Graham. If a solution is separated from the pure solvent by a membrane that is permeable to the solvent but not the solute, the solution will tend to become more dilute by absorbing solvent through the membrane. ...read more.

Middle

Equipment Potato Knife Borer Ruler Pen Pencil Paper Water Supply Test Tube Test Tube Rack 70ml Sucrose (Varying Strength % [5-30]) Labels Method 1. Chop the ends of the potato. 2. Use the same borer to obtain 7 cylinders of potatoes all of the same length and diameter. Record the Measurements in the Table. 3. Rinse each one in cold water. 4. Put each cylinder of potato into a test tube containing 10ml of sucrose solution of varying strength ensuring that the cylinders of potato are completely submerged. 5. Label each test tube and store in test tube rack. 6. Leave the test tubes close to each other for 24 hours. 7. After 24 hours record the length and diameter of each potato. Fair Test Assume that the pressure and temperature in each case is the same as each factor could affect osmosis. Insure that volume size and surface area of each cylinder is the same and that they are all from the same potato. Insure that the only variable that we are altering is the concentration of the solution. Safety This is a reasonable safe experiment and there are not many safety rules to follow. Just take precaution as usual in the science lab. ...read more.

Conclusion

Evaluation I have enjoyed doing this experiment and creating coursework based on it. I particularly liked the potato chopping and recording the results. I think that the experiment went to plan. I gained a large majority of accurate results by carrying the experiment out, as well as learning new methods and techniques. I did on the other hand come across some anomalous results that gave me some trouble. These results are the cause of some misunderstanding in the science lab and other students recording some inaccurate results, this therefore affected the whole classes results. To rule out any anomalous results on my behalf I carried out the experiment five times to be completely accurate. Even with the problems encountered I think that the results that I have gained are accurate and have draw a strong conclusion. If I were to carry out the same investigation again I would create a more detailed method to reduce the likelihood of more anomalous results. I would also use dialysis tubing containing sugar solution instead of the potato chip to see weather it comes to a conclusion of the same results. To gain greater knowledge of the osmosis experiment from a different angle next time I carry out the investigation I will change the aim of my experiment from finding the size to finding the weight of the potato chip or dialysis tubing containing sugar solution. Neel Joshi Osmosis Coursework Science Coursework - Page 1 of 10 ...read more.

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