The vapor pressures of chloromethane and dichloromethane are compared using barometers to show the effect of polarity on vapor pressure.
The measurement of pressure exerted by a vapor is demonstrated using barometers. The vapor pressures of chloromethane and dichloromethane are compared.
Dichloromethane has the higher vapor pressure because it is less polar than chloromethane.
Chloromethane and dichloromethane differ in their polarity. Predict which would have the higher vapor pressure.
When chloromethane is injected, the chloromethane rises to the top and vaporizes. The mercury column is depressed to 556 millimeters. When dichloromethane is injected into the open end of the barometer, the dichloromethane rises to the top and vaporizes. The mercury column is depressed to 350 millimeters.
Dichloromethane has the higher vapor pressure because it is less polar than chloromethane.
- Design and Demonstration
- Kristin Johnson University of Wisconsin - Madison, Madison, WI 53706
- Text
- Kristin Johnson University of Wisconsin - Madison, Madison, WI 53706
- John W. Moore University of Wisconsin - Madison, Madison, WI 53706
- Video Production
- Jerrold J. Jacobsen University of Wisconsin - Madison, Madison, WI 53706
- Graphics
- Kristin Johnson University of Wisconsin - Madison, Madison, WI 53706