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# Osmosis – A Special Type Of Diffusion

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### Osmosis – A Special Type Of Diffusion

1. 1. Osmosis – a special type of diffusion Lesson objective I will know what osmosis is
2. 2. Method <ul><li>Using a cork borer, collect 3 equal 2cm pieces of potato. </li></ul><ul><li>Cut each length into 10 slices </li></ul><ul><li>Weigh each set of 10 slices </li></ul><ul><li>Place each set in different solutions (0.3M, 1.0M sucrose and distilled water) </li></ul><ul><li>Leave for 20 minutes and reweigh. </li></ul>
3. 3. Results Solution Mass Before (g) Mass After (g) Mass Difference (g) 0.3M sucrose 1.0M sucrose Distilled water
4. 4. Diffusion is the spreading of the particles of any substance in solution, resulting in a net movement from a region where they are of a higher concentration. (end up with even spread of particles)
5. 5. <ul><li>Make a prediction as to whether each set will either lose mass, gain mass or stay the same. </li></ul>
6. 6. Osmosis <ul><li>The movement of water from a dilute to a more concentrated solution through a partially permeable membrane that allows the passage of water but not solute molecules. </li></ul><ul><li>Osmosis is passive this means it does not need energy </li></ul>You need to write this!
7. 7. Osmosis Dilute Solution Concentrated Solution Net movement of water The water will move into the concentrated solution until both are equal. The solutions are said to be ISOTONIC Solute Water
8. 8. Osmosis <ul><li>Water inside plants gives support to the plant. </li></ul><ul><li>When water moves into the cell by osmosis it increases the pressure inside the cell. </li></ul><ul><li>The cell walls are strong enough to withstand this pressure. </li></ul><ul><li>It is this pressure that keeps the cells turgid and hence supplies support. </li></ul>You need to write this!
9. 9. Illustrate with diagrams to describe how water moved across a semi-permeable membrane in each case
10. 10. Conclusion No net movement - Isotonic Potato loses mass - flaccid Potato gains mass - turgid Potato 0.3M Potato 1.0M Potato Water Sucrose Water