VP Data

From the data table concerning vapor pressures of liquids, construct table 1 on the stat editor of the calculator by assigning:

  • L1=Temperature (°C)
  • L2=Chloroform (mm Hg)
  • L3=Ethyl Alcohol (mm Hg)
  • L4=Acetic Acid (mm Hg)

Construct an xyplot of the vapor pressure of water, chloroform and ethyl alcohol as a function of temperature.

  • Sketch the graph.


Questions:

  1. Draw a horizontal line on your graph and trace to determine the normal boiling point of each liquid.
  2. Which substance at 40°C has the greatest rate of evaporation?
  3. Explain why the vapor pressure and temperature relationship is not a straight line relationship?
  4. Which substance has the strongest intermolecular attractions?
  5. Which substance has a greater vapor pressure, chloroform at 60°C or acetic acid at 40°C?
  6. If the external pressure were dropped to 280 mm Hg, which substance(s) would boil or be boiling at 55°C?