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Abstract

Protocol

Representative Results

Materials

Chemistry

Boiling Points

Published: Not Published

  1. Preparation of the Laboratory

    Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed.

    • Put on the necessary personal protective equipment, including a lab coat, chemical splash goggles, and gloves.
    • The students will need to use both acetone and ethanol in their experiment. Label a glass bottle with the solvent name, and then pour a smaller volume of solvent from the stock bottle into the glass bottle, ensuring that there is enough for each group to have about 1 mL. Do the same for the other solvent and then place these bottles in a communal hood.
    • Set out the following glassware and equipment at each student lab station (we suggest that students work in pairs):
       1    Lab stand
       1    Hotplate
       1    Lab jack
       1    Rubber band
       1    Medium 3-prong clamp
       3-4    Glass capillary tubes
       1    Pipette bulb
       2    1-mL volumetric pipettes
       2    Glass test tubes
       1    250-mL beaker
       1    25-mL beaker
       1    Digital thermometer

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What is the boiling point of a compound?

The boiling point of a compound is the temperature at which the transition from the liquid into the gas phase occurs. This occurs when the vapor pressure of the solution is equal to the atmospheric pressure.

What is vapor pressure?

Vapor pressure is the force of the gaseous phase on the liquid phase of a compound in a closed system at equilibrium.

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  • Lab stand
    5
  • Thermometer clamp
    5
  • Digital thermometer (60 -150ºC range)
    5
  • Glass capillary tube
    20
  • Rubber band
    5
  • Test tube (3 -5 mm)
    10
  • 1-mL glass pipette
    10
  • Pipette bulb
    10
  • Acetone (99.5%> pure)
    10 mL
  • Ethanol (99.5% pure)
    10 mL
  • 25-mL glass beaker
    5
  • 250-mL glass beaker
    5
  • Stirring hotplate
    5
  • 25-mL glass bottle with cap
    2
  • Powder funnel
    2
  • Digital barometer
    1

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