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Osmosis - How Does the Concentration of Salt Solution Affect Osmosis?

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Osmosis-How Does the Concentration of Salt Solution Affect Osmosis? Introduction What is Osmosis? Wherever particles can move freely from one place to another, diffusion will take place. Osmosis takes place when water particles pass through a partially permiable membrane, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. The water molecules will diffuse freely from the area of lower concentration to that of a higher concentration. This movement will continue until neither solution is more concentrated than the other is, and they have reached equilibrium. What Will We Investigate? I will carry out an investigation into how the concentration of the salt solution will affect osmosis. I will do this by repeating the same experiment using water, 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar and 1.0 molar salt solutions. ...read more.


Each solution must also be the same temperature. If a solution is hotter then the molecules move about faster, causing more collisions and therefore osmosis to occur quicker. If we are to use more than one potato, all potatoes used must be exactly the same, as different types of potatoes with different textures will act differently. If the surface area of one chip is bigger than another then this will affect osmosis, as osmosis can occur quicker through a larger surface area than through a smaller one. We must also keep the volume of solution constant; infact the only variable will be the concentration of the solution, as we want to see what affects this has on osmosis. Preliminary Results. Solution Initial mass of potato(g) Final mass of potato(g) Water 1 1.68 1.83 2 1.67 1.80 3 1.65 1.80 Salt solution 1 1.44 1.36 2 1.50 1.38 3 1.68 1.61 Prediction From the results of our preliminary experiment above, we can make a fair prediction as to how concentration affects osmosis. ...read more.


1.0 molar 1 1.50 0.94 -0.56 -37 2 1.50 0.97 -0.53 -35 3 1.50 0.96 -0.54 -36 Conclusion From the previous graph it is clear that as the concentration of salt solution increases, the more the mass of the potato chip decreases. This is because more water molecules must leave the potato chip to make the salt solution less concentrated, and the potato chip more concentrated. The diagrams below show the difference in molecular activity in the less concentrated solution to that in the higher concentrated solution. As you can see from the diagrams above, it will take much longer, and many more water molecules to balance out the concentration in the more concentrated salt solution. My final results are very similar to my preliminary results, in that the higher the concentration, the greater the loss in mass. It seems that from my preliminary results I made an accurate prediction as to what would happen in terms of osmosis. ...read more.

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