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Osmosis.I will cut lots of small potato pieces using the cork borer from the SAME potato. I wil measure the amount of Nacl to distilled water according to the varying molar solutions

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Introduction

Osmosis Coursework My Prediction Osmosis the the movement of water molecules which pass through a partially permeable membrane from an area of high water potential to an area of low water potential. Therefore, ina high concentration of NaCl, the water will move out of the potato causing it to shrink. In low The larger the concentration of water in the outside of the solution the better the amount of water that enters the cell by osmosis. However, there will be a point where the concentrations of water inside and outside the potato cells are equal (isotonic). At this point there will be no change in the length, volume and mass of the potato, as the net movement of water will be zero, no osmosis has occurred. ...read more.

Middle

I will leave it for 10 minutes. The temperature of the room must remain roughly the same, so it does not allow any anomalous results to appear. After 10minutes of soaking the potatoes with different solutions, I will weigh up the potatoes and produce a mean set of results. Results 1. 0.25m- 3.68 2 0.5m- 3.51 3 0.75m- 3.49 4 1.00m- 3.32 Analysis The results show that, in accordance with our hypothesis, the cylinders will expand when external solute concentration is low (high water concentration), and contract in strong solutions (low water concentration). This is due to osmosis, where water passes from weak solutions to strong solutions across a semi-permeable membrane, such as a cell membrane. ...read more.

Conclusion

A possible factor affecting my results is that although the cylinders were taken from the same potato there is no guaranteeing that the density remains the same throughout the potato. Another factor is that the potato from which the cylinders are taken could be abnormal - this could be prevented by amalgamating sets of results, for example of a whole class, where each experimenter used a different potato. I think that three sets of results was a good number. However, I think that in order to improve my results, the last concentration (1 moler) needs to be retaken as it is an anomalous result. Further work could be carried out to include concentrations that increased in 0.1 M rather than 0.2M. This would increase the accuracy and improve the graph. Other investigations could include using different varieties of potato or different plant tissues e.g. carrot. ...read more.

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