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# Osmosis – A Special Type Of Diffusion

## on Nov 09, 2009

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## Osmosis – A Special Type Of DiffusionPresentation Transcript

• Osmosis – a special type of diffusion Lesson objective I will know what osmosis is
• Method
• Using a cork borer, collect 3 equal 2cm pieces of potato.
• Cut each length into 10 slices
• Weigh each set of 10 slices
• Place each set in different solutions (0.3M, 1.0M sucrose and distilled water)
• Leave for 20 minutes and reweigh.
• Results Solution Mass Before (g) Mass After (g) Mass Difference (g) 0.3M sucrose 1.0M sucrose Distilled water View slide
• 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) View slide
• Make a prediction as to whether each set will either lose mass, gain mass or stay the same.
• Osmosis
• 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.
• Osmosis is passive this means it does not need energy
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• 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
• Osmosis
• Water inside plants gives support to the plant.
• When water moves into the cell by osmosis it increases the pressure inside the cell.
• The cell walls are strong enough to withstand this pressure.
• It is this pressure that keeps the cells turgid and hence supplies support.
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• Illustrate with diagrams to describe how water moved across a semi-permeable membrane in each case
• Conclusion No net movement - Isotonic Potato loses mass - flaccid Potato gains mass - turgid Potato 0.3M Potato 1.0M Potato Water Sucrose Water