Chemistry Lecture Demonstration Facility - Demos

Vapor Pressure - Boiling Water Without Heat

Brief Description:

Boiling Water at Reduced Pressure

Purpose/Goal:

Pressure's effect on the boiling point of a liquid

Explanation of Experiment:

The boiling point of a liquid is defined as the temperature at which the vapor pressure of the liquid is equal to the external pressure. When the pressure above a liquid is reduced, the vapor pressure needed to induce boiling is also reduced, and the boiling point of the liquid decreases. At 250 C, water boils at an external pressure of 24 mmHg. As the water boils, heat is lost due to the heat of vaporization of water, which is 40.88 kJ/mol. Eventually, the water may cool to a temperature at which the vapor pressure is less than the external pressure provided by the pump, at which point the water will stop boiling.

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Location

The CLD Facility is located in the prep room adjacent to the Beck Hall Auditorium (map).

Mission Statement

The mission of the CLD Facility is to provide the highest level educational experience for Rutgers chemistry students, to increase the visibility of the Department of Chemistry and Chemical Biology and to elevate the reputation of Rutgers as a top tier learning institution.

Contact

RobertPorcja 2015 v1a

Bob Porcja, Coordinator
porcja@chem.rutgers.edu