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In this practical investigation I am investigating the effects of osmosis in a potato. I will place potato chips in different concentrations of salt solution and water.

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Introduction

Osmosis Science Practical Investigation Fatimah Jilani 11. A1 Osmosis Aim: In this practical investigation I am investigating the effects of osmosis in a potato. I will place potato chips in different concentrations of salt solution and water. Introduction: I am investigating the effects of osmosis in a potato chip. Below are other factors that could be investigated: * Temperature of water. * Size of chip. * Light. * Mass of potato. * Concentration of water. As part of this Science Practical Investigation I am investigating the effects of Osmosis on potato chips. Water is the most important thing determining the growth as well as the survival of plants. Therefore water and other substances need to enter and leave the cell through the cell membrane. Particles enter and leave cells through these processes: * Diffusion * Osmosis Particles in liquids and gases have kinetic energy. This allows them to move around at different speeds in different directions. In an area of high concentration, some of these particles collide with each other and lose their energy therefore slowing down. Other particles will escape from the concentrated area to places where there are fewer particles or no particles, a less concentrated area. Very few particles leave an area of low concentration to go to an area where the concentration is higher. This creates a diffusion gradient. So the result is that particles diffuse from an area of high concentration to an area of low concentration caused by the kinetic energy of the molecules. These particles will continue to move from an area of high concentration to an area of low concentration as long as there is a concentration gradient or until the particles are evenly spread out through the available space. ...read more.

Middle

Plan of Experiment: Diagram: Apparatus: * Testube * Testube rack * Potatoes * Tissues * Stopwatch * Scales * Water * Salt Solution * Potato corer * Measuring cylinder (50ml) Method: 1) Get a potato and using a potato corer take out six chips of potato. 2) Weigh each potato and try to make each potato chip weigh the same as the lightest potato chip or to the nearest 0.01g. 3) After that measure out the concentration for each testube in the diagram and then set up the apparatus as shown in the diagram. 4) Leave potatoes in testubes for 20 minutes. 5) After twenty minutes have past on the stopwatch take out each potato and roll gently on tissue to wipe off any excess water or salt solution 6) Record the results and repeat experiment three times. 7) Take measurements before and after the experiment and work out mass difference in percentage as well. 8) Plot graph and analyse. Safety: As I am working with liquids I shall not work near any sockets as that may be very dangerous. I will not walk around with equipment when I have wet hands as that could cause me to break equipment. Variables and Fair test: There are several variables to this experiment which are listed below: * Light * Concentration of water * Surface area of potato chip * Size of chip * Temperature of water I have chosen to vary the concentration of water and salt solution. In order to carry out a fair test I shall keep the other factors under control and the same. ...read more.

Conclusion

If you refer to my graphs you will see that in Graph 1 only one point is on the line of best fit. But this does not mean to say that my results were not very accurate because they were. The rest of the points are close to the line of best fit showing that my experiment was fairly accurate. But I feel that the measurements taken for testubes 3 and 3 I was not as accurate as I was for the other testubes. This may be due to an error on the scales or how much force I put when rolling the potato chips dry. In future I shall try to be more accurate at doing both things. In Graph 2 again only one point goes through the line of best fit and the other five points are fairly close. This shows that my experiment was quite accurate giving me fairly accurate results. I think the reason that my results were as accurate as they were because I repeated my experiment three times which meant that I was able to do better each time I repeated the experiment. In future I will repeat my experiment more than three times as this will give me more accurate results. I think the biggest disadvantage for this experiment was that I did not let the experiment run for very long. I think with more time I would have been able to support my theory better and my results may have been more accurate. I think with the results that I have I was able to make quite good conclusions but for maximum accuracy and better conclusions I would have to let the experiment run for longer. Overall the investigation was quite satisfying. ...read more.

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