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Set up an investigation to show the correct strength sugar solution he should use, in which the store the chips. The chips must not gain water or loose water.

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Introduction

Osmosis Task: Charles Chip owned a popular fish and chip shop and his chips were the best in the area. Set up an investigation to show the correct strength sugar solution he should use, in which the store the chips. The chips must not gain water or loose water. Planning The variables I could investigate are the type of potato, the temperature of the solution, the strength or dilution of the sugar solution, time, and container and the size of the chip. I have chosen to investigate the strength of the sucrose solution because of osmosis and the movement of water molecules. I will have a range of six; these will be 1 molar --> distilled water. In each test I will put the same sized chips, the same mass, length and diameter of chip will also be the same and also the same type of chip. I will measure accurately by using electronic balance, 30cm ruler and a calibrated pipette. I have made this a fair test by only using one variable. To make sure my investigation is reliable I will make sure it's a fair test. I will know the correct solution to store the chips in because the chips will be the same size and mass as when they were when we started the investigation. ...read more.

Middle

I have dun the same experiment two times again, this will help me prove that I am doing a fair test and that the results will be nearly the same. Experiment 2 Solution Sucrose (1m) Distilled water H2O Start mass (grams) Finish mass (grams) Difference 0.4 4 6 2.4 2 -0.4 0.3 3 7 2.4 2.1 -0.3 0.2 2 8 2.4 2.4 0 0.1 1 9 2.4 2.5 +0.1 0 0 10 2.4 2.5 +0.1 As you can see the 0.2 molar has not lost or gained any weight. Experiment 3 Solution Sucrose (1m) Distilled water H2O Start mass (grams) Finish mass (grams) Difference 0.3 3 7 2.4 2.3 -0.1 0.2 2 8 2.4 2.4 0 0.1 1 9 2.4 2.5 0.1 Again I can see that 0.2 molar has not lost any or gained any weight. I think that this proves that a weak solution of sucrose is the best formula. The measuring instruments I used were a pipette, a measuring cylinder, electronic scales and a ruler to measuring the chips. I measured and recorded 3 sets of results. I did not so many type s of results for the last set because I knew that the answer would be around the last part of the table. ...read more.

Conclusion

Nevertheless, the second and third results were the same apart from one solution. This could have been because the room temperature could have been different between the tow experiments. This supports my predictions because I knew what osmosis was and that smaller molecules fit through the membrane much more effectively. Evaluating My experiment was good because we measured out the solution as accurately as we could that made most of the results the very similar. Also because it proved my prediction on what would happen. My experiment was poor because we could have done all three investigations in the same temperature and the mass of the chips all could have been the same. My results were accurate because we used accurate measuring equipment they were also reliable because we did the experiment more than once so we could see if we were getting the right kind of results. I could improve my investigation having better measuring pipettes and cylinders, I also could time the investigations to make sure they all get the equal time and make sure that they are all in the same room temperature. I could extend my investigation by trying out more variables such as the temperature because osmosis could happen faster if it is warmer. Or the type of potato that Charles Chip could use. ...read more.

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