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To investigate the effect of varying concentrations of a certain sugar solutions on the amount of osmotic activity between the solution and a potato chip of a given size.

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Introduction

Osmosis Assessment Osmosis is the diffusion of water from a dilute solution to a more concentrated solution through a partially permeable membrane that allows the passage of water molecules but not solute molecules. This basically means water diffuses from where it's in a high concentration to where's it's in a low concentration. Aim: To investigate the effect of varying concentrations of a certain sugar solutions on the amount of osmotic activity between the solution and a potato chip of a given size. Plan: I plan to find out by using cut potatoes in the shape of chips to study osmosis, by seeing how different concentrated and a pure water solution will effect the chip. I will study water moving from a high concentration, to a low concentration along a concentration gradient. Fair Test: During the experiment I will keep the experiment fair by making sure each chip is the same length (6cm), and that I put the same amount of solution in each Measuring Cylinder. ...read more.

Middle

and potatoes * Potato Slice-To cut potatoes into chips * Potatoes- Part of the experiment * Pen-To write with * 12 Sticky Labels- To label the test tubes 1-6 Diagram of Apparatus: Method: First I got the apparatus listed above. I cut 1 potato in to chips using the chip slice. I gathered 12 chips from the slice, and cut them all the same length (6cm) using the scalpel knife and the cutting tile. I lined 6 of the potatoes on a paper towel and numbered them 1-6 using the pen. I placed the other 6 on a different piece of paper towel and numbered them 1-6 using the pen. I then set the electronic measuring scales to the grams setting and measured each chip, I then recorded there weights on my results table. I then labelled 6 of the test tubes 1-6, and then repeated this with the other 6. I then measured 100ml pure water in a measuring cylinder and put 20ml it in each of the test tubes labelled number 1. ...read more.

Conclusion

7.06 0.74 0.45 11.92 11.88 4g 5.654 6.19 7.25 7.09 0.71 0.90 10.86 14.55 5g 6.669 6.05 7.50 7.05 0.81 1.00 11.11 16.52 Conclusion: I feel I collected enough evidence during the experiment to support my hypothesis. The evidence I have gathered during the experiment is: * Osmosis did take place in the experiment * Pure water chip did way more on removal * The greater sugar solution the less the chip weighed on removal Evaluation: I feel the experiment went well overall; I followed the instructions given to me by Mr Sheridan. To make the experiment more successful I believe that we could have left the chips in the potatoes longer, to see if that changed the results. Also you could add more solution instead of 20ml, maybe 35ml for example. I could make a higher concentration of sugar solution to see if this affected the results. I could also decrease the amount of water used in the whole experiment and leave the experiment for a shorter period of time. Jamie Noke 10ANS Biology Coursework (Osmosis) Mr Sheridan 10S ...read more.

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