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Experiment To Investigate The Factors Affecting The Rate Of Osmosis

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Introduction

Experiment To Investigate The Factors Affecting The Rate Of Osmosis Aim: To investigate a factor that may affect the rate of osmosis. Outline: I will weigh a potato cylinder and record the weight. Then I will put the potato cylinder in a test tube with a sugar solution for 10 minutes and then measure the potato again. Then I will change the concentration of the sugar solution, and conduct the experiment again and determine if by changing the concentration of the sugar solution, the rate of osmosis was affected. Osmosis is the net movement of water (or any solution) molecules from an area of high concentration to an area of low concentration across a semi-permeable membrane. This membrane may be a cell wall, which lets smaller molecules such as water through, but not bigger molecules like sugar through. Possible Factors: Temperature of sugar solution: by increasing the temperature, the kinetic energy within the molecules increases, and therefore the molecules move around more quickly and may be able to get across the semi-permeable membrane more quickly than if the solution was at a lower temperature. ...read more.

Middle

Therefore the more light the solution is exposed to the quicker the rate of osmosis, because the warmer the solution would be, therefore increasing the kinetic energy between the molecules and speeding up the rate of osmosis. Variable The variable I have chosen to control is the concentration of the sugar solution. I will change the concentration of the sugar solution from 0% sugar to 50% sugar. With 10% intervals in between. Therefore I will experiment this variable at 0%, 10%, 20%, 30%, 40% and 50%. Prediction I predict that the higher the concentration of the sugar solution, the more water will travel across the semi-permeable membrane. Osmosis is the movement of particles of one solvent of a solution, in this case water, across a membrane and therefore other constituents cannot pass through the membrane, in this case the sugar. To see if the rate of osmosis has been affected, after I collect all my results, I will calculate the percentage mass average. ...read more.

Conclusion

Apparatus ? Test tube ? Potato ? Scalpel/knife ? Tile ? Potato borer ? Stopwatch Method 1. I will set up the apparatus as shown on the diagram 2. I will pour the concentration of sugar solution being tested into a test tube. 3. I will cut a potato cylinder using a potato borer, weigh it using scales and measure its length and thickness and make sure that all the potato cylinders are the same measurements to ensure a fair test. 4. I will record the weight of the potato cylinder and place it in the test tube with sugar solution. 5. I will start the stopwatch. 6. Once 10 minutes have passed I will take out the potato cylinder and weigh it and record the weight. 7. Then I will repeat steps 2-6 again but with a different concentration of sugar solution. 8. Once I have collected all the results, I will analyse them and decide if my prediction was right. I will do this by analysing results and graphs. Diagram ...read more.

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