Chemiluminescent Ammonia Fountain
Crystallization from Supersaturated Solutions of Sodium Acetate
Density and Miscibility of Liquids
Electrical Conductivity of Liquids and Solutions
Osmotic Pressure of a Sugar Solution
Vapor Pressure of Solutions: Raoult’s Law
A Visual Demonstration of Raoult’s Law
Water Softening – Hard and Soft Water With Soap
Clean Air With the Cottrell Precipitator
Color of Sunset: the Tyndall Effect
Getting Colder: Freezing Point Depression
Getting Hotter: Boiling Point Elevation by Nonvolatile Solutes
Salting Out: Making Liquids Immiscible
Volume Increase Upon Neutralization
Vapor Pressure of Solutions: Raoult’s Law
Description: Video tape of different mole fractions of decane and diethyl ether being injected into mercury barometers. The drop in mercury level is related to the mole fraction of each of the components that make up solution.
This demonstration is also available on JCE “Chemistry Comes Alive!” Vol. 2 CD-Rom
Source: JCE software “Chemistry Comes Alive!”
Year: 1999 Vol: 76 Page: 1311
Keywords: Vapor pressure, Vapor pressure of solutions, Colligative properties, Mixtures, Mole fraction, Raoult’s Law
Rating: 
Hazard: Low
- Electric shock hazard
- Video or simulation
Effectiveness: Good
- Good connection from demo to course material
- Low failure rate
- Time to results is low
- Mild effects are seen by audience
- Observable with guidance
Difficulty: Low
- Examples involving models or simulations
- Simple procedures
Safety Precautions:
- Use of UL approved three-prong plug and outlet
- Eye protection required
Class: Video or Simulations, Properties of Solutions, Equilibrium, Vapor pressure
Division: General, Physical Chemistry
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