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An Experiment To Show The Effect Of Osmosis on Potato chips in a sugar solution.

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Introduction

An Experiment To Show The Effect Of Osmosis on Potato chips in a sugar solution. Planning Aim To show how different concentrations of sugar solutions affect osmosis in the potato chips. Prediction I predict that as the amount of sugar in the solution increase, the amount of water moving in or out of the potato will change. I think that a solution of just water will make the potato increase in weight. And a solution of high sugar will make the potato decrees weight. I think this will happen because water will move in to the potato, as it is less dense than the sugar solution. Fair test To create a fair test certain aspects of the experiment will have to be kept the same whilst one variable is changed. I have chosen to vary the concentration of the Sugar solution. For the purpose of my experiment I am going to carry out all the experiments at room temperature so that the experiment wont be affected by evaporation. The mass of the potato is a dependent variable. This means that it will be measured throughout the experiment. The potato chip will be weighed before it is put in the solution, and after. ...read more.

Middle

The range of molars chosen is between 0.2 and 1 molar of sugar I have chosen this because after 1 molar of sugar osmosis is not as effective. Solution Molar Starting weight (g) Finish weight (g) Percentage increase or decrease (%) 0.0 0.2 0.4 0.6 0.8 1.0 Now place each potato chip in its relevant boiling tube. Start a stopwatch and wait for 10 minuets. In the 10 minuets take 6 sheets of filter paper and label them like you labelled the boiling tubes. As soon as the 10 minuets are up remove all the potato chips from their tubes and place them on the relevant pieces of filter paper. Now re weigh the potato chips and record their new weight in the chart in the highlighted column. Solution Molar Starting weight (g) Finish weight (g) Percentage increase or decrease (%) 0.0 0.2 0.4 0.6 0.8 1.0 To work out the percentage increase or decrease in the chips weight you need to use the formula difference in weights/original amount x 100. Record the results of this equation in the last column. Repeat the whole experiment at least two more times to make sure the results you have are accurate. ...read more.

Conclusion

Finish weight (g) Percentage increase or decrease (%) 0.0 3.42 3.66 +5.8 0.2 2.96 2.99 +1.0 0.4 3.13 2.96 -5.4 0.6 3.28 2.92 -9.8 0.8 3.14 2.83 -10.9 1.0 3.22 2.71 -15.8 Solution Molar Starting weight (g) Finish weight (g) Percentage increase or decrease (%) 0.0 1.75 1.90 +8.6 0.2 1.75 1.90 +8.5 0.4 1.70 1.65 -2.9 0.6 1.85 1.70 -8.1 0.8 1.80 1.65 -8.3 1.0 1.80 1.60 -11.1 The red results show anomalies in the results. Evaluation Evidence Evaluation From my results you can see that potato chips left in a higher solutions of sugar have lost weight and the potato chips in the lower sugar solution have gained weight. This is because of a type of diffusion called osmosis. Osmosis is the movement of water molecules across a permeable membrane. The water moves from a place of high water concentration (e.g. a solution of just water) to a place of lower water concentration (e.g. a high sugar solution). In this experiment the potato acts as the permeable membrane. The water moves from the potato chip or into the potato chip depending on how strong or weak the sugar solution is. Below is a diagram showing how the water molecules move from water to a strong sugar solution. Osmosis takes place when water moves both ways threw a membrane. The ...read more.

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