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Investigate if osmosis occurs in potatoes and whether varying the concentration of sucrose solution affects the water/mass gain or loss in the potato chips when kept in a constant environment.

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Introduction

2/0 To se 6/03e how varying the concentration of Sucrose solution affects the water Gain or loses on a potato Chip during osmosis. Aim To investigate if osmosis occurs in potatoes and whether varying the concentration of sucrose solution affects the water/mass gain or loss in the potato chips when kept in a constant environment. Equipment * 5 same volume test tubes: to hold sucrose solution and potato chips. * 2M, 1M and 0.5 M sucrose solution (15ml) * Distilled water: as a control to all the other experiments ( to compare the pure water to the sucrose solutions) * Test tube rack: to hold test tubes. * Measuring cylinder (15ml): to measure sucrose solution) * 5 small pieces of potato (0.7*0.7*3.1 cm) * Knife: to cut potato into size. * Pipette: to transfer sucrose solution from container to test tube. * Mass balance: to measure mass of potato chips at beginning and end of experiment. * Timer: to time the experiment making sure each potato chip receives the same amount of time in the test tube. * Tissue paper: to dry the potato after osmosis has taken place- so it is a fair test. * Cutting tile: to cut the potato safely not damaging the lab tables. ...read more.

Middle

* Make the 5 potato chips from the same potato as different potatoes may have a different permeable membrane or one that is different to the others. * Do the experiment at room temperature. * Keep the water content in the potato the same by using chips from the same potato and by not washing or exposing them to water. * Use the same mass balance as some balances may have worn out over time making them read masses incorrectly or different manufactures of balances may measure the sizes of the units differently making measurement slightly different between scales. Safety Precautions * I will take care using the knife as it is very sharp and is designed to be used to cut hard substances such as potatoes, which will easily pierce my skin or other students around me. * I shall also take care when handling the solutions as they may get in to our bodies internally and as we are not aware of the capability of the solution and what harm it can do to us. Scientific Knowledge Osmosis is the movement of water particles from a higher concentration to a lower concentration across a partially permeable membrane. A partially permeable membrane is just a membrane with tiny holes in them that only allow small enough particles to pass through them. ...read more.

Conclusion

As there is a higher concentration of water in the solution and a lower concentration in the potato then due to osmosis water will enter the potato and cause a mass increase. If my prediction is true then the graph that I will draw from my results will look like this rough one: Time (minutes) See Key on next page Key Solution with low concentration of sucrose, Solution with high concentration of sucrose This graph gives us the basic idea of how osmosis in the potato should occur. The solution with a low concentration of sucrose must have a high concentration of water so consequently percentage mass change should be positive and an increase. Whereas the solution with a high concentration of sucrose must have a low water concentration, so water will pass from the potato to the low concentration of water making water content balance. This will then cause the percentage mass change to decrease as shown by the red line of the graph. Taking into consideration, we did a preliminary test of the experiment to see whether we could improve the final run. We can see from the preliminary results in the Results section that the prediction was fairly accurate and supported the scientific knowledge, although we learnt from the preliminary work that we should use smaller sized potato chips as the got stuck in the test tube. ...read more.

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