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My aim is to find out the effect that different solutions (water, sugar solution, salt solution) have on the process of osmosis on a potato chip. To measure this change I will use a scale that measures in (g).

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Introduction

Osmosis is the passive process by which water molecules move from an area of high concentration to an area of a lower concentration through a semipermeable membrane. My aim is to find out the effect that different solutions (water, sugar solution, salt solution) have on the process of osmosis on a potato chip. To measure this change I will use a scale that measures in (g). Factors that might affect the osmosis process are: Temperature Concentration Surface Area Type of potato Different solutions The factor I have chosen to vary in my experiment is "Different solutions". In my experiment I will keep the concentration, temperature, surface area and the type of potato the same to ensure it's a fair test and so my results are reliable because if I investigate more than one factor at the same time I could not be sure of which factor would be affecting the process of osmosis. The table below indicates the factors that I will be keeping the same and the factor I will be changing. Temperature Concentration Surface Area Type of potato Different Solutions Room temp. Same N/A King Edward Water Room temp. Same N/A King Edward Salt Room temp. Same N/A King Edward Sugar Changed factor Left the same I predict that the potato chip in water will increase in weight, this is because in the ...read more.

Middle

After collecting these results I will work out the change in weight and see whether it was an increase or a decrease, and with that I can workout the percentage change in weight. Below shows the tables in which I have recorded my results. Weight Before 1st Results Change In weight % change King Edward In Water 1.65g 1.79g + 0.14g 9% King Edward In Salt 1.63g 1.29g - 0.34g 21% King Edward In Sugar 1.69g 1.2g - 0.49g 30% In the table above I show the results for my first reading, which was taken after 3 hours of the potato chips being exposed to the solutions. Also it shows the change in weight from when the potatoes were first weighed to when the reading was taken. And from that I was able to calculate the percentage change, which is necessary, as all the chips did not weigh the same to begin with. Weight Before 2nd Results Change In weight % change King Edward In Water 1.65g 1.84g + 0.19g 12% King Edward In Salt 1.63g 1.23g - 0.4g 25% King Edward In Sugar 1.69g 1.19g - 0.5g 30% In the table above I show the results for my second reading, which was taken after 6 hours of the potato chips being exposed to the solutions. ...read more.

Conclusion

I think that the experiment went well over all, there were no complications when doing the experiment and all went according to plan. I think that I did not collect enough results and I should have collected more, then I could have a larger view of the process of osmosis. Although with the results I gathered it was enough to make informative charts. Some of the precautions I took when conducting my experiment was to ensure that the variables, which I was not changing, were always the same. Whilst cutting the potato, extreme care and precision had to be taken with the scalpel, as it is very sharp and could easily cause a serious wound. When recording the results I had to make sure that I wrote the same reading as the one given by the scale. I had to ensure that every time I handled the potatoes my hands were clean and dry. This was to stop any kind of contamination and to make sure that I did not pass on any extra water onto the potato. If I were to repeat the experiment I would change my independent variable, as it was quite difficult changing the solutions. If I were to improve the experiment I would make more solutions available for testing and I would give myself more time to collect more results. Lawrence Ireton Year 11 ...read more.

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