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Osmosis

Osmosis. Notes: What is osmosis?. Osmosis is a special type of diffusion It is the diffusion of water across a differentially permeable membrane from a region of high WATER concentration (dilute solution) to a region of lower WATER concentration (concentrated solution)

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Osmosis

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  1. Osmosis

  2. Notes: What is osmosis? • Osmosis is a special type of diffusion • It is the diffusion of water across a differentially permeable membrane from a region of high WATER concentration (dilute solution) to a region of lower WATER concentration (concentrated solution) • Small molecules e.g. water are able to pass through the cell membrane easily

  3. Notes This beaker is divided into 2 by a differentially permeable membrane. On one side is pure water, on the other is sugar solution In a sugar solution some of the space is taken up by sugar so the concentration of water is less The water will start to spread out evenly but the sugar will stay on the same side.

  4. Because of the different in concentration of water molecules more water will move from the water to the sugar solution The sugar solution will gain water. A higher level of water on one side will result in pressure called osmotic pressure

  5. Sketch this diagram Salt or sugar!!

  6. Activity 9: Eggsperimenting with Osmosis • Purpose: to Observe the way water moves through a semi-permeable membrane due to osmosis. • Materials • 4 de-shelled eggs • 250g Salt • 200ml Distilled water • 200ml NaOH solution • 4 250ml beakers labelled A-D • Electronic balance • Paper towels • Digital camera

  7. Procedure • Weigh each egg and record staring weight • Place egg in a beaker of table salt – make sure none of the egg is showing above the salt – Label A • Egg B – Place in beaker and cover with distilled water • Egg C – Place in beaker C and cover with 0.1 M salt solution • Egg D – Wrap in plastic wrap and put into beaker D • Cover each beaker with plastic wrap • Leave eggs overnight

  8. On Monday • Wash of excess salt • Dab with paper towel to remove excess water • Weigh each egg • Complete table pg 61 • Answer questions on 62/63

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