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Questions and Answers
What was the reason for the increase in mass and fullness in the Visking tubing filled with sucrose solution?
Osmosis was observed in the Visking tubing filled with water.
False
What type of solution caused osmosis to occur in the Visking tubing?
Less concentrated solution
Visking tubing is similar to a cell membrane because it is _______.
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Match the following types of tubing with their descriptions:
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Which statement is true about the experiment with Visking tubing?
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Study Notes
Demonstration of Osmosis
- The experiment utilizes Visking tubing, which simulates a cell membrane due to its semi-permeable nature.
- Visking tubing allows only small molecules to pass through, similar to biological membranes.
Experimental Procedure
- Soak two strips of Visking tubing in water for the experiment.
- Secure each end of the tubing with knots and fill one with sucrose solution and the other with water.
- After sealing, dry outer surfaces and measure initial mass using an electronic balance.
- Monitor fullness or turgidity of the tubes before immersion in a solution for 30 minutes.
- Post-immersion, dry the tubes again and reweigh to observe any mass change, noting any turgidity differences.
Results and Observations
- The tube containing sucrose solution increased in mass and turgidity, illustrating osmosis as water entered the tube from a less concentrated external environment.
- The tube filled with water showed no mass change, indicating that osmosis did not occur due to equal concentration between internal and external environments.
Key Takeaways
- Osmosis is the movement of water across a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration.
- The experiment emphasizes the role of concentration gradients in osmosis and highlights how Visking tubing effectively demonstrates this process.
Additional Notes
- Other materials with semi-permeable properties include:
- Cellophane
- Dialysis Tubing
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Description
This quiz explores the procedure and results of an osmosis demonstration using Visking tubing. Participants will evaluate the effects of different solutions on the tubing's mass and turgidity, gaining insights into the principles of osmosis. Test your understanding of the process and outcomes of this classic biology experiment.
