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Osmosis Investigation

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My Understanding of Osmosis Osmosis is the diffusion of water from a dilute solution (with many water molecules) to a more concentrated solution (containing less water molecules) through a semi permeable membrane. The semi permeable membrane only allows the passage of the water molecules from the solutions and not the solute molecules. The movement of the water molecules will continue until they are evenly spread on both sides of the semi permeable membrane. Below is a diagram of a turgid plant cell that cannot hold any more water. This is a healthy plant cell. It is important that a plant has plenty of water in its cells in order to stay healthy. Below is a flaccid cell that does not contain much water. This is an unhealthy plant cell. If a plants cells are flaccid the plant wilts. This is because it does not contain enough water in its cells to stay healthy. Investigation Procedure My practical investigation of osmosis will go as follows. ...read more.


Wearing safety glasses and being careful can easily prevent these risks. Prediction I predict that the potato immersed in the most dilute salt solution will grow the most. This is because diffusion of the water in the solution will move by osmosis into the potatoes plant cells and make them turgid. The extra water molecules will make it larger than before. I will also predict that the potato immersed in the most concentrated solution will decrease in size. This is because the potato contains more water molecules than the solution so will therefore, by the process of osmosis, move into the solution the potatoes water molecules. I think that one of the solutions at molar 0.3 or 0.4 will leave the potato at the same size because it will have roughly the same amount of water molecules as the potato contains in its cells. A solution with molar 0.6 is more concentrated than that of molar 0.1. Equipment > Six pieces of potato > Measuring equipment > 10 mls of each salt solution > Six test tubes > Test tube rack > ...read more.


The general pattern is that the stronger the salt solution, the most water lost and vice-versa. Evaluation In all experiments, improvements can be made. Noticing these improvements is the tricky job if your experiment went well. I have noticed a few improvements that could have been made to make a more accurate set of results for my investigation. 1) More accurate cutting and measuring with better equipment would have helped to make sure that the potatoes were already exactly the same size. 2) A wider range of salt solutions would have enabled me to carry out more tests and get more results to confirm that osmosis had occurred and where. 3) I could have collated my results with the rest of my class and worked out a better average from many different sets of results. 4) Odd results such as the result for the 0.2 molar solution that had got smaller could have been repeated and a new, more accurate result could have been found. 5) Lastly I could have used molar solutions like 0.25, 0.3, 0.35 etc. to make my results accurate. 6) 7) 8) 9) ?? ?? ?? ?? December 00 Osmosis Investigation Andrew Muckles 1 ...read more.

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