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An investigation to see whether, and how the amount of sugar in water affects the osmotic activity of potato chips

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Introduction

An investigation to see whether, and how the amount of sugar in water affects the osmotic activity of potato chips Aim: To investigate the effect of varying concentration of sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. Prediction: I think that the lower the concentration of the sugar solution in the test tube the larger the mass of the potato will be. This is because the water molecules pass from a high concentration in the water, to a low concentration in the potato chip. Therefore, the chips in higher water concentrations will have a larger mass than in higher sugar concentrations. Fair test: To create a fair test certain aspects of the experiment will have to be kept the same while one variable is changed. I am going to vary the concentration of the sugar solution. ...read more.

Middle

have all been cut without being washed and peeled. The mass of the potato is a dependent variable, and this means that it will be measured throughout the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in the solution, and after. This will allow us to see whether anything has happened.. The potato chips must be totally covered in the solution, and the amount of solution will be kept the same because all the potato chips are the same size. Apparatus: Potato chips Six petri dishes Labelling stickers Electronic scales Sucrose soloutions ranging from 0.00molar to 1.00 molar Electronic stopwatch Method: First, I took six petri dishes, lined them up on the table, and put a sticker on the lid so I knew which one was which. ...read more.

Conclusion

The gradient of the line on the graph above changes towards the end of the line, showing that the potato chips were near saturation point as I increased the concentration of sugar in the water. Evaluation: The experiment was very successful in my opinion. I obtained a large quantity of very accurate results from which I was able to create informative graphs. I think I took easily enough results for the amount of concentrations that I was using, and the time that I used for the experiment to last was enough to allow sufficient osmosis to occur. However if I was to repeat the experiment I might well increase the time of the result to allow more osmosis to happen and possibly find out the saturation point of the chips. The range of concentrations was adequate but I would possibly create more concentrations if I repeated the experiment so that I would have more varied results, i.e. 0.10m, 1.15m, 1.20m, and so on. ?? ?? ?? ?? ...read more.

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