Group Members Ebone’ Crutcher- Central High Timberly Wilson- Ridgeway High Kimberly Jones- Hillcrest High Brittanye P. Westbrook- Middle College High.

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Presentation transcript:

Group Members Ebone’ Crutcher- Central High Timberly Wilson- Ridgeway High Kimberly Jones- Hillcrest High Brittanye P. Westbrook- Middle College High Angelo Hutchison- Craigmont High

WHAT IS OSMOSIS & DIFFUSION(1)  Osmosis and Diffusion are processes that occur at the cellular level. Both involve the movement of something from high concentration to low concentration.  Diffusion is usually defined as the passive movement of solute particles within a space or through a membrane.

WHAT IS OSMOSIS & DIFFUSION(2)  Osmosis always refers to the movement of solvent (water) molecules through a membrane.  The movement of a substance across a separating membrane is due to different concentrations of the substance on each side of the membrane.

To find out the rate of osmosis in potato tissue plugs placed in distilled water, 10% sodium chloride, or 20% sodium chloride solutions.

Hypothesis  Potato tissues would absorbs water (Turgidity) when placed in a hypotonic solution & would shrink (plasmolysis) in a hypertonic solution.

Materials Per Group Potato plugs Electronic balance Graduated cylinders Paper towels Distilled water Timer Sodium Chloride (NaCl)

1. Cut the potatoes into 7.5 cm plugs. Use a 5mm diameter cork borer to cut three potato cylinders for each beaker. Do not include the skin. 2. Keep potato cylinders in a covered 400 ml beaker. 3. Fill beaker #1 with 10% sodium chloride, beaker # 2 with 20% sodium chloride, and third one with distilled water only.

4. Take the initial weight of each group of potato cylinders and record the mass. 5. Let the potato cylinders stand in the solution for 10 minutes. 6. Every ten minutes remove potato cylinders, gently blot with paper towels. 7. Take the weight of each group of potato cylinders and Record the mass.

Comparison

Results  Potato plugs in distilled water imbibed maximum water & Became very plump & brittle  10% sodium chloride decreased the weight of potato plugs shrinking the plugs  20% sodium chloride decreased the weight of potato plugs the maximum amount

Conclusion Potato plugs experiments clearly demonstrarted the principle of osmosis Potato plugs experiments clearly demonstrarted the principle of osmosis