Intro Chemistry Lab I
Experiment 6- Enthalpy of vaporization of water
This report will have a full length lab report, worth about 14% of your grade.
They will need to be submitted to your TA in lab and to turnitin.com
The format is described on pages 9-13 in the manual. Do not leave out any sections.
You will calculate the vapor pressure of water as a function of temperature by measuring the
volume of an air bubble as a function of temperature.
From this, you can determine ∆H
Fill the graduated cylinder 2/3 full
Invert into a beaker of water
Reading on graduated cylinder should be 4-5ml
This fixes the number of air molecules
Heat the water in the beaker and observe the expansion of the bubble.
Expansion due to heating air in bubble and water vapor, which increases with
Bubble of 4.5mL at room temperature is best.