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An investigation to find the affect of sugar concentration on osmosis in potato chips.

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Introduction

An investigation to find the affect of sugar concentration on osmosis in potato chips Introduction: Osmosis is the passage of water molecules from an area of high concentration to an area of low concentration through a partially permeable membrane. In this case, Osmosis applied to the practical because the aim was to see if a sugared solution had an effect on osmosis in potato chips, it was intended to find out if different concentrations of sucrose solution caused a selectively permeable membrane, or a potato chip, to become larger or smaller. It was planned to use six different concentrations of sucrose solution and for each concentration; three sets of results were taken. The change of weight for each result was then found and finally, the average weight change was found. Prediction: It was predicted that the higher the sugar concentration, water would transfer from the potato into the sugared solution making the potato decrease in weight, and vice versa for the lower sugar concentrations. It was believed this would happen because since the solution was diluted with water, the water molecules will transfer over to the stronger solution. Thus materializing osmosis. Fair test: To create a fair test certain aspects of the experiment were kept the same whilst one key variable was changed. ...read more.

Middle

All three times the experiment took place in a laboratory and was a safe experiment as no dangerous chemicals were used. The below are the table of results for all three experiments conducted: Table of results for experiment 1: Concentration of sugar solution (%) Mass before (g) Mass after (g) Change (g) 0.0 2.01 2.18 + 0.17 5.00 1.87 1.94 + 0.07 10.00 1.88 1.91 + 0.03 15.00 1.92 1.78 - 0.14 20.00 1.91 1.64 - 0.27 25.00 1.95 1.6 -0.34 Table of results for experiment 2: Concentration of sugar solution (%) Mass before (g) Mass after (g) Change (g) 0.0 1.92 2.04 + 0.12 5.00 1.96 1.98 + 0.02 10.00 1.97 1.93 - 0.04 15.00 1.96 1.79 - 0.17 20.00 1.97 1.67 - 0.03 25.00 2.06 1.68 -0.38 Table of results for experiment 3: Concentration of sugar solution (%) Mass before (g) Mass after (g) Change (g) 0.0 1.92 2.04 + 0.12 5.00 1.96 1.98 + 0.02 10.00 1.97 1.93 - 0.04 15.00 1.96 1.79 - 0.17 20.00 1.97 1.67 - 0.03 25.00 2.06 1.68 -0.38 Recording the results of the weight after each experiment was very easy. There was little hassle involved. Therefore producing an accurately detailed result table. Table of results to show the average amount of weight gained/lost over all three experiments: Strength of solution Change 1 (g) ...read more.

Conclusion

but in the second and third experiments it decreased by 0.04 grams this is quite a considerable loss considering the second and third results were identical. Possible explanations for this could be that the sugar solution was measured wrongly or there was an error in recording the results. Alternatively, it may have been left in the solution slightly longer than planned therefore giving them maximum exposure to greater osmosis. Evaluation: In conclusion, to all the information found in this investigation it was felt that the experiments were a success. A reasonably informative graph could be produced from the results, the experiment was repeated enough times for an adequate analysis to be made. However if the experiment was to be repeated again it would be sensible to leave the potatoes in their solution for a longer amount of time as to give the experiment ample time for osmosis to occur and therefore much more defined results. Another thing that could have made the results more precise would have been a measuring scale that went up to three or more decimal places as to ensure perfect results. Overall, the results were adequate, the aim was realized, the prediction was correct and it was a fair test; therefore producing a successful investigation of finding the effect of sugar concentration on osmosis in potato chips. By charley lennard ...read more.

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