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Osmosis Investigation

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Introduction

Kerry Belshaw 10B OSMOSIS INVESTIGATION For my investigation, I have been given the task of examining and analysing osmosis. I already know that "osmosis is the spontaneous passage or diffusion of water molecules through a semi-permeable membrane, from a high concentrated solution to a low concentrated solution". Using this I will finally have to come up with an average of the loss or gain in mass (by osmosis) to the cell, to help me give an evaluation. I will be able to use any equipment that I feel is required. Preliminary work It is important that I do preliminary work so that I can get familiar with the experiment, the equipment and work out which cell tissue absorbs or depletes the greatest amount of water, to give the most accurate results. Also, the objective of further preliminary experimentation is to investigate with different variables like the amounts of water, cell tissue and different concentrations of the water e.g. whether to use sugar, salt or just water. When doing preliminary work it is still important to carry out the general safety procedures like making sure no test tubes are bear the edge of a desk as they could be knocked off, by tying your hair back and putting all stools under the desk. ...read more.

Middle

Consequently, the water in the potato chip that is soaking in the salt water will migrate out of the potato leaving a rather disgusting lighter, mushy potato chip. So the more salt I add each time in each experiment the more the potato chip will decrease in mass. Here is a diagram to explain the process of osmosis a bit clearer: Observations Amount of solute 1 mass (g) before after 2 mass (g) before after 3 mass (g) before after mass before(g) mass after (g) mass of loss/gain (g) Experiment 1 0.5 6.20 6.16 5.81 5.61 6.47 5.62 6.36 5.80 -0.56 Experiment 2 1.0 5.67 6.14 5.63 6.70 5.67 6.78 5.66 6.42 +0.76 Experiment 3 1.5 5.99 5.15 6.14 5.26 5.77 4.71 5.97 5.04 -0.93 Experiment 4 2.0 6.00 4.71 5.57 4.52 5.40 4.51 5.66 4.58 -1.08 Experiment 5 2.5 6.71 5.09 6.05 5.49 6.58 5.11 6.45 5.23 -1.22 Experiment 6 3.0 5.97 4.10 6.02 4.63 5.83 4.00 5.94 4.24 -1.38 = odd results I have done each experiment three times so that I would be able to get accurate averages to use in my graph to make it a fair experiment. I have labeled the graph on the y-axis with the total amount of mass loss or gain; in this case the results are both minuses and pluses because of the extraordinary process of osmosis and the way the slightest change can vary your results dramatically. ...read more.

Conclusion

to pass. Osmosis refers only to transfer of solvent; transfer of solute is called dialysis. In either case, the direction of transfer is from the area of higher concentration of the material transferred to the area of lower concentration. This spontaneous migration of a material from a region of higher concentration to a region of lower concentration is called diffusion. I would like to extend my experiments to see how osmosis affects other tissue membranes and by using different solutes. Experimentation is necessary to determine which membranes permit osmosis, because not all membranes act in this way. Two solutions separated by a semi permeable membrane are said to be isotonic if no osmosis occurs. Many membranes allow all or none of the constituents of a solution to pass through. Osmosis occurs under the influence of hydrostatic pressure, equals the flow of water. The hydrostatic pressure establishing this equality of flow is called osmotic pressure. Also, it would be highly interesting to investigate reverse osmosis and another lot of variables enables you to carry out extensive experimentation to get the answers you want about osmosis. Reverse osmosis is a process, which is used to remove dissolved impurities from water. It is used in the generation of potable water from salt water and the manufacture of ultra pure water for the power and electronic industries. ...read more.

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