Model of Osmotic Pressure
Description: Lentils and beans are used to represent molecules of two different sizes. The screen between them is small enough only to let the lentils through to the other side. Initially the “fluid” levels are equal. Shaking the container mixes the two “molecules” together. Soon, the “fluid” levels are different on the two sides of the screen.
Source: Journal of Chemical Education – Vol. 76
Year: 1999 Vol: 76 Page: 64
Keywords: Lentils, Fluid levels, Osmosis, Membrane
Rating: 
Hazard: Low
- Model or simulation
Effectiveness: Average
- Mild effects are seen by audience
- Good reliability
- Time to results is low
- Good connection from demo to course material
Difficulty: Low
- Simple manipulations for most to perform
- Simple procedures
Safety Precautions:
- Eye protection required
Class: Simulations, Properties of Solutions, Equilibrium of Chemical Systems, Osmosis
Division: General, Physical Chemistry
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