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Osmosis experiment

Extracts from this document...

Introduction

Osmosis Is the passage of water from an area with a high concentration to an area of low concentration through a semi-permeable membrane. Water can pass through a semi-permeable membrane because a water particle is small enough to fit through the pores in the membrane where as the larger sugar particles cannot pass through the pores. Osmosis in plant cells Plant cells are surrounded by a cell wall which is fully permeable, which means it will let any molecules pass through it which means osmosis will not take place through the cell wall. Different to animal cells plant cells also have a cell membrane. The cell membrane is semi-permeable so osmosis can take place. A plant cell in dilute water (0 mol/dm�) takes in water by osmosis through its cell membrane. As the water goes in, the cytoplasm and vacuole in the cell swells. The cell wall stops the cell from bursting, when the cells are swollen up they are said to be "turgid". Variables Variable How it is controlled Shape of chip Use a cork borer to get chips of the same size Volume of concentration Use a measuring cylinder to get the same amount of solution Time Carry out experiment with equal amounts of times measure this with a stop clock Concentration Use the same concentration of solution on each different potato chip. ...read more.

Middle

The point where my line crosses the X axes in where the solution is isotonic with the solution in the cell. Any points below the X axes the solution is hypertonic to the sugar in the cells. Points above the X axes the solution is hypotonic to the sugar in the cells. Apparatus Boiling tubes, boiling tube rack, measuring cylinder, stop clock, digital balance, cork borer, scalpel tile, sucrose solution, and beaker. Apparatus diagram This is how I am going to set up my apparatus. Method 1) Cut the potato into 35 chips using he cork borer. 2) Rinse and pat dry. 3) Weigh potato chips individually then find the mean. 4) Measure out the quantities and right molarity of solution. 5) Put the solution into the boiling tubes and place boiling tubes in rack. 6) Put potato chips into the solutions and leave for an hour. 7) When the hour passes remove potato chips from boiling tubes. 8) Pat potato chips dry and weigh. 9) Record results. Method for making correct solutions concentration Percentage of sucrose solution. (%) Percentage of de-ionised water. (%) Calculation to find percentage 0f sucrose solution 1 mol/dm� 50% 50% 25x2�50=1 0.9 mol/dm� 22.5% 77.5% 22.5x2�50=0.9 0.8 mol/dm� 20% 80% 20x2�50=0.8 0.7 mol/dm� 17.5% 82.5% 17.5x2�50=0.7 0.6 mol/dm� 15% 85% 15x2�50=0.6 ...read more.

Conclusion

0.7 8.182 60 5 7.31 0.872 0.6 8.182 60 1 7.526 0.656 0.6 8.182 60 2 7.526 0.656 0.6 8.182 60 3 7.526 0.656 0.6 8.182 60 4 7.526 0.656 0.6 8.182 60 5 7.526 0.656 0.5 8.182 60 1 7.866 0.316 0.5 8.182 60 2 7.866 0.316 0.5 8.182 60 3 7.866 0.316 0.5 8.182 60 4 7.866 0.316 0.5 8.182 60 5 7.866 0.316 0.4 8.182 60 1 8.236 -0.054 0.4 8.182 60 2 8.236 -0.054 0.4 8.182 60 3 8.236 -0.054 0.4 8.182 60 4 8.236 -0.054 0.4 8.182 60 5 8.236 -0.054 0.3 8.182 60 1 8.42 -0.238 0.3 8.182 60 2 8.42 -0.238 0.3 8.182 60 3 8.42 -0.238 0.3 8.182 60 4 8.42 -0.238 0.3 8.182 60 5 8.42 -0.238 0.2 8.182 60 1 8.778 -0.596 0.2 8.182 60 2 8.778 -0.596 0.2 8.182 60 3 8.778 -0.596 0.2 8.182 60 4 8.778 -0.596 0.2 8.182 60 5 8.778 -0.596 0.1 8.182 60 1 9.048 -0.866 0.1 8.182 60 2 9.048 -0.866 0.1 8.182 60 3 9.048 -0.866 0.1 8.182 60 4 9.048 -0.866 0.1 8.182 60 5 9.048 -0.866 0 8.182 60 1 9.382 -1.200 0 8.182 60 2 9.382 -1.200 0 8.182 60 3 9.382 -1.200 0 8.182 60 4 9.382 -1.200 0 8.182 60 5 9.382 -1. ...read more.

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