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# My aim for this investigation was to investigation was to investigate the effect of varying the concentration of a certain salt solution on the amount of activity between the solution and the potato.

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Introduction

Changing Chips Aim My aim for this investigation was to investigation was to investigate the effect of varying the concentration of a certain salt solution on the amount of activity between the solution and the potato. Results Table of molarity of salt solution: Volume of salt solution required per tube - 10cm� Volume of salt Solution cm� Volume of water (cm�) Total Volume (cm�) Molarity of salt Solution M/mol 10 0 10 1.0 8 2 10 0.8 6 4 10 0.6 4 6 10 0.4 2 8 10 0.2 0 10 10 0.0 The table below are my original results: Mass of potato after 1 hour immersion in salt solution (g) Molartiy of solution M/Mol Volume of salt solution (cm�) Mass of potato before immersion Run 1 Mass (g) Run 2 Mass (g) 1.0 10 1.00 0.78 0.78 0.8 10 1.00 0.80 0.81 0.6 10 1.00 0.83 0.81 0.4 10 1.00 0.89 0.87 0.2 10 1.00 0.98 0.97 0.0 10 1.00 1.10 1.12 I have now average my results: Mass of potato in salt solution Molarity of solution M/Mol Run 1 Mass (g) Run 2 Mass (g) Run 1 Mass (g) Run 2 Mass (g) ...read more.

Middle

bigger, this is because the potato chip is becoming flaccid, and so the change in mass of each molar concentration is becoming closer together because there is a less weight change. 3 Conclusion "I predicted that as the concentration increased, the weigh of the potato will decrease", has proven to be right. The reason for this is because that osmosis will make water molecules move from a high concentration to a lower concentration. To conclude this up, I can say the movement of the water though a selectively permeable is affected by the concentration of the solution. The higher the concentration of the solution, the more the potato chip will lose weight. Basically, as the concentration of solution increases, the water is less able to move to the potato, causing the water from the potato to move to the solution as therefore will be decreasing its weight. In this experiment, I believe that I have collected enough data to support my prediction. Having the results and the graph which backs up my prediction, it proves that this investigation was fully successful. From the scientific knowledge which I collected, I can say this experiment was successfully carried out in the process. ...read more.

Conclusion

Maybe also the top pan balance was not cleaned every time, otherwise there would have been excess water and fragments of the potato on the balance, which could had an effect on the results. However if I was to repeat the experiment I might well increase the time of the experiment to allow more time for getting more accurate results and completing the experiment in a slower process. The range of concentrations was enough but I would possibly create more concentrations if I repeated the experiment so that I would have more varied results, i.e. 0.0, 0.1, 0.2 etc... instead of 0.0, 0.2, 0.4 and so on in an attempt to achieve more accurate results. I could also introduce other variables such as temperature. Another problem was the fact that I was forced to rely on inaccurate tools to cut the potato cylinders such as scissors, scalpels and my own judgement. Yet another complication is that there is no guarantee that each potato was the same density throughout the experiment, in fact it is highly unlikely. Finally another idea is try other similar vegetables such as sweet potatoes, carrots, turnips and parsnips, to see the different type of osmosis which is happening and also then compare the results. 4 Changing Chips Aneil Patel ...read more.

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-0.3 -19.23076923 5 1.63 1.46 -0.17 -10.42944785 6 1.61 1.37 -0.24 -14.9068323 average 1.675 1.396666667 -0.278333333 -16.43252525 Concentration of salt solution Average %change Distilled water 9.76 0.25m -4.01 0.50m -7.98 0.75m -11.23 1.0m -12.62 1.25m -13.3 1.50m -16.43 The temperature when I was doing my actual results was 27�C.

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