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Investigating the Effect That Concentration of Sucrose Solution Has On the Osmosis of Potato Chips.

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Introduction

/02Katie Muston Investigating the Effect That Concentration of Sucrose Solution Has On the Osmosis of Potato Chips Introduction During this investigation I am going to investigate how varying the concentration of sucrose affects the rate of osmosis on potato chips. I will do this by finding and recording the length of each potato chip before and after it is placed in sucrose solution for a certain length of time. Then I will calculate the percentage change in length of potato chips at each concentration and I will take three readings in order to calculate the average. Using this information I will plot a graph and this will then be analyzed. From this I will be able to draw an accurate conclusion. Variables and Key Factors These are the variables and key factors that I will need to consider: 1) Solution concentration 2) Solution volume 3) Duration of experiment 4) Temperature 5) Conditions which experiment is performed in 6) Dimensions of potato chip In order for this to be a fair test some aspects of the experiment will have to be kept the same whilst one key variable is changed. ...read more.

Middle

x 100 = Percentage Change in Length Original length (mm) I will the look at these results in order to see which factors would be most suitable for my actual experiment to be the most accurate. Preliminary Work Results Size of PotatoChips (From Smallest to Largest) Length (mm) After 3 hours Percentage Difference in Length (%) Length (mm) After 6 hours Percentage Difference in Length (%) 1 27.6 8 26.9 10.33 2 25.7 14.33 28.2 6 3 26.3 12.33 25.1 16.33 4 28.1 6.33 28 6.66 From these results we can see that a potato cylinder of diameter 3 in sucrose solution for 6 hours will give the best range of results. Method 1) Using a cork borer I cut out 15 potato cylinders. 2) Using a scalpel and a caliper I cut the cylinders down to exactly 30mm. 3) I then took 5 petri dishes and labeled them : A) 50cm3 sucrose solution, 0cm3 water B) 40cm3 sucrose solution, 10cm3 water C) 30cm3 sucrose solution, 20cm3 water D) 20cm3 sucrose solution, 30cm3 water E) 10cm3 sucrose solution, 40cm3 water 4) Using a measuring cylinder I measured out the correct amount of sucrose and water solution for each petri dish. ...read more.

Conclusion

I managed to obtain results that were not altogether accurate but did provide the information to create a graph that followed my theory. I think I took the right amount of results but taking more would of made it more accurate. The 6 hour time period was enough time to allow osmosis to occur but I could of easily gained similar results in a shorter time span. If I were to repeat the experiment I would try and find out the saturation point of the potato pieces. I had an adequate range of concentrations but creating more concentrations is a possibility if I was to repeat this experiment as I could produce a wider range of results. My results were fine even though the exact results were not persistent. This cause was probably human error, I may not have dried some potato pieces as well as other, and some would then have more excess water adding to the length at the end. If I repeat the experiment again I will look into finding some other way of drying the potatoes more thoroughly. Also my initial measurements may have been incorrect. However I think the experiment was very successful and I am pleased with the complete comparison of my results with the initial prediction I made. ...read more.

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