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Gcse Osmosis

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Osmosis Coursework Prediction: I predict that the higher the concentrated solution, the smaller the mass and the lower the concentrated solution, the larger the mass. Results: Batch Concentration of solution (M) Original Mass (g) Final Mass (g) Change in mass (g) Change in Mass (%) A 0.0 2.62 2.88 +0.26 +9.92 B 0.2 2.59 2.68 +0.09 +3.47 C 0.4 2.75 2.77 +0.02 +0.72 D 0.6 2.47 2.38 -0.09 -3.64 E 0.8 2.56 2.42 -0.14 -5.46 F 1.0 2.60 2.40 -0.20 -7.69 Analysis: On my graph at number 1, there is a high mass gain at a low concentration of solution. At number 2, there is a low mass gain at a higher concentration of solution. At number 3, there is an equal amount of solution at an equal concentration of solution. ...read more.


As a result osmosis will not occur. Osmosis will occur through the partially permeable cell membrane, when a plant is in pure water. The cytoplasm and vacuole swell as the water goes in. However, the cell wall is stronger than the cell membrane, so the plant cell doesn't burst. The plant is then turgid because the plant cell has been blown-up like a 'tyre'. Plant cells are usually turgid. A plant in pure water: Batch D, E and F have a high concentration of solution and a decrease in mass. Plant cells plasmolyse in concentrated solutions. Unlike batch A, B and C, the cytoplasm and the vacuole will shrink instead of swelling. Now the cell is flaccid because some of the air has leaked out and the 'tyre' becomes floppy. ...read more.


To improve my experiment in the future I will repeat it 3 times to get more accurate results. At o.4M on my graph there is an anomolous result. You could avoid this anomolous result by repeating the experiment 3 times. To improve the whole experiment if I were to do it again I would repeat the experiment 3 times, so that you can calculate an average and make the results more accurate. I would also use a greater range of concentrations such as 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 or 0.0, 0.2, 0.4, 0.6, 0.8, 1.0. I would also use more accurate equipment to measure the volume of the liquid such as a burette or maybe a ruler. Also I would use a different kind of cell instead of a potato cell, for example a celery cell or an onion cell. My Graph: ?? ?? ?? ?? James Smith Osmosis Coursework 5/1/2008 ...read more.

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