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To investigate osmosis in potato chips when being placed in sugar solutions of different strengths.

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Introduction

Planning (P2A) Aim To investigate osmosis in potato chips when being placed in sugar solutions of different strengths. (P2A) Safety precautions > Use equipment appropriately > Wash hands before and after practical > Always be alert of any dangers surrounding you > Do not take any risks which could involve danger > Handle equipment with care > Be careful of spillage when using solutions > Put knife flat after use > Ensure not to put water near sockets > If you have long hair tie it back (P4A) Fair test In order to make my investigation fair and reliable there are specific variables I need to keep the same if they are not kept the same these factors can affect my results. The factors are: Size of chips I will do this by measuring and cutting the potato chips accurately. Temperature I will do this by completing and collecting my results in an area where the temperature is constant such as a classroom it is kept constant because of room temperature. Volume of solution I will do this by measuring the solution in a measuring cylinder Time I will do this by leaving the potato chips in the solution for the same time. There is only 1 variable I will change and that is the concentration of water and sugar to see how it affects osmosis in potato cells. (P4B) ...read more.

Middle

Volume of glucose (ml) Volume of water (ml) Initial length (cm) Final length (cm) Change in (cm) Change in (%) Average change in length A 1 mole 40 0 3 2.5 - 0.5 16.6 + 11.6 B 0.75 mole 30 10 3 2.9 - 0.1 3.3 + 3.3 C 0.5 mole 20 20 3 3 0.0 0.0 + 0.0 D 0.25 mole 10 30 3 3.1 + 0.1 3.3 + 3.3 E 0.0 mole 0 40 3 3.3 + 0.3 10 + 10 You can see by looking at my table how a strong concentration and a weak concentration affect's a potato chip over a certain length of time. Analysis (A2A) What happened? After completing my 2 readings in my practical and accomplished my results I identified what happened. I identified that the more volume of glucose there was the more the potato chip would shrink and if there was a weak concentration of water the potato chip would increase in size. This is because water in osmosis moves from a high concentration to a low concentration and if there was a high volume of glucose that would mean the water would be in the potato chip and it would move to a low concentration which would be in the glucose solution because of this the potato chip would decrease as it is lacking water. But in the other hand if there was a high volume of water it would mean all the water is in the solution so the water ...read more.

Conclusion

> It was difficult to measure the solution with a measuring cylinder so I think I should of used a pipette as it has a smaller measuring scale which would make the result more accurate. (E6A) Reliability of evidence The time I leave the chips in the glucose solution affects the process of Osmosis. The time affected Osmosis because when I came to take the chips out of the solution I had to take them out one at a time so some potato chips stayed in the solution longer than others. I tried to keep all the variables the same for example: > Temperature > Volume of solution > Size of chips I had no control over the temperature as the test tubes that the potato chips were placed in were left overnight in a classroom and the temperature may of decreased by a degree or increased. (E6B) Improvements to further work It was difficult to keep all the experiment accurate and to achieve reliable results but I think I have completed the experiment accurately but I have realised some mistakes or improvements that I would of liked to make to my experiment such as: > Measuring the change in length I could of overcome this problem by leaving the potato chips in the solution longer and maybe by using a wider range of results. There are no other major improvements I would like to add to my work so overall I think I have worked hard sensibly and independently. By Ricky Gill 10T Science Coursework Mrs Gordon Ricky Gill 1OT Year 10 Science Coursework Mrs.Gordon Osmosis ...read more.

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