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# A solution effect the rate of osmosis in potato chips.

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Introduction

dVicky Brady 7th July 2oo3 Does the Concentration of A solution effect the rate of osmosis in potato chips The Variables The variables in this experiment are; - * Concentration * Temperature * Amount of solution * Amount of Potato * Type of Potato The variable I am going to investigate is concentration Background Knowledge The topics that I have studied on osmosis are: - * Osmosis * Osmosis in plants * Turgidity * Plasmolysis Fair Test To make this experiment a fair test I must: - * Have the same amount of solution throughout the experiment * Keep the temperature of the solution the same * Amount of Potato the same * Type of potato the same I must keep all these factors the same throughout my experiment to make it a fair test. I will make my measurements as accurate as possible and will repeat each solution 3 times. Preliminary Experiment To decide the measurements and the strength of concentration in my experiment I had to do a preliminary experiment. In my preliminary experiment I set up 6 test tubes each containing a different concentration of sugar solution. I set this up so in my final experiment I could se that all these concentrations made an effect and would give me a clear difference in results. ...read more.

Middle

The diagram shows this. Plasmolysis is when plant cells are placed in strong solutions water passes out of the cells by osmosis. As water passes out of the cell, the sap vacuole starts to shrink. These cells are no longer firm. They are limp. We say that these cells are flaccid. As more water starts to leave the cell the cytoplasm starts to peel away form the cell wall. These cells are plasmolysed. Turgidity is when a plant cells are places in a weak solution. The weak solution enters the cell by osmosis. This happens because the cell sap contains a strong solution. The cell membrane again acts as the partially permeable membrane. The cell begins to swell up as water enters the cell. The water then starts to push against the cell wall and soon the cell contains as much water as it can hold. The strength in the cell wall stop it from bursting. We now say that this cell is turgid. Procedure * Get lab coat and goggles. * Put them on. * Collect all the apparatus needed for experiment. * Set up equipment * Cut the chips out of the potato using the potato borer * Measure them using the venier callipers and weigh them * Record these measurements * Measure out 30ml of solution. ...read more.

Conclusion

So the potato losses weight. (Plasmolysis) Evaluation Overall our experiment went well. We collect all of our results in the time allowed and we had no anomalies. I think that our method of collecting the results was good but there were a few faults. When we were taking the results we didn't check the temperature to make sure they were all the same, our measurements were done using the human eye and may have not been correct. Also when we were re-measuring we needed to make sure that there was no excess liquid present and on some we didn't adding weight to the chip. Lastly when adding the chip to the solution some may have been added before others giving more time for osmosis to happen in some. To improve our experiment we could use a gradual pipit that measures accurately. Also we cloud have placed our test tubes in a water for the whole experiment keeping them at a steady temperature. We could also take more time at the end to fully dry the potato chip before weighing so that all the excess liquid has been removed. To gain further evidence on this topic I will go on science investigates and compare my results to theirs. Their results will have more accuracy so it will be good to compare my pilot investigation to their wider investigation. ...read more.

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