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Use different concentrations of sucrose solution to determine the internal concentration of the potato.

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Introduction

Introduction Aim 1. To use different concentrations of sucrose solution to determine the internal concentration of the potato. 2. To use different concentrations of a solution more dilute than the internal concentration of the potato to find out what the effects of different sugar concentrations have on the movement of water into the potato. Theory Osmosis is the movement of water from a dilute solution to a more concentrated solution, through a partially permeable membrane, until the concentrations are equal. Therefore, we need to find out the internal concentration of the potato so that we will know which concentration of sucrose solution will make water move into the potato, though Osmosis. Once we have done this, it is possible to increase the dilution to find out the effects of the water that moves into the potato. Prediction 1. If the internal concentration of the potato is the same as the concentration of the potato is the same as the concentration of the solution, then osmosis will not happen and the weight will remain unchanged. ...read more.

Middle

Preliminary Work Equipment list Potato Core Borer 5% sucrose solution 10% sucrose solution 15% sucrose solution 20% sucrose solution Scalpel Ruler 4 boiling tubes White tile Measuring cylinder Method 1. Bore the potato with the Core Borer 2. Cut the potato into twenty four 0.5cm discs 3. Towel the discs off to remove excess moisture. 4. Weigh the discs 5. Put six of the discs into each of the boling tubes. 6. Measure 100cm� of each of the concentrations of sucrose solutions into the boiling tubes. 7. Cover them with cling film and then leave for twenty-four hours. 8. Weigh them again 9. Towel the discs off again to remove excess moisture. Results Sucrose conc % Final mass Initial mass Mass change % Mass change 5 1.50 1.37 0.13 9.49 10 1.35 1.33 0.02 1.50 15 1.28 1.30 -0.02 -1.54 20 1.16 1.48 -0.32 -21.62 From this experiment I decided to use 5% solution for my main experiment. Main work Equipment list Potato Core Borer 5% sucrose solution Scalpel Ruler 5 boiling tubes White tile Measuring cylinder Method 1. ...read more.

Conclusion

the problem of temperature, we used 6 discs and left it for 24 hours to eliminate the problem of incorrect surface area, we stopped water from evaporating by covering each boiling tube with cling film, and we towelled off the discs to remove excess moisture. However, to eliminate the anomalies completely, we could have used a papet instead of a measuring cylinder because the measuring cylinder is not always accurate. Also we can't be sure that all the osmosis that could have happened did happen. We could have eliminated this problem by weighing it in trials after every hour until the mass did not change. Finally, we might have destroyed the membrane while preparing the potato and to eliminate this problem we would do an experiment with visking tubing which would involve putting water into a testube and sugar solution into the visking tubing and then leave it for 24 hours. The results I obtained lend some evidence to support the prediction, however since there were so many anomalies I would need more evidence to lead to a firm conclusion. ...read more.

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