chem

posted by .

why would it be dangerous to heat a liquid in a distillation apparatus that had no vent or opening to the laboratory?

- is this because the liquid will create vapor pressure and could cause a serious injury to a student?

  • chem -

    - is this because the liquid will create vapor pressure and could cause a serious injury to a student?

    The likely hood is for the joints on the apparatus to come apart, possibly very rapidly, and the a large volume of the material to escape as a gas. If the apparatus is "quick fit" with ground glass joints then these are designed to take a vacuum and, with clips attached, a low positive pressure.

    There are a few occasions where distillation is carried out in a sealed apparatus. This is carried out with a vacuum line and is used where the material is very expensive or toxic or maybe unstable in the air and low boiling.

    If you are interested in reading further on these techniques see:
    http://en.wikipedia.org/wiki/Schlenk_line
    and some of the links in the article.

    also "Guide for the Perplexed Organic Experimentalist"
    by H J E Loewenthal.
    which was written for grad students but has some interesting insights.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Ap Chemistry

    at 25 degrees Cliquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will …
  2. AP CHEM-URGENT PLEASE

    at 25 degrees C liquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will …
  3. Gen Chem

    A liquid is heated from 33.96°C to 104.32°C. The vapor pressure increases from 23.54torr to 984.35torr. What is the heat of vaporization of the liquid in kJ/mol?
  4. chemistry

    which of the following factors affect the vapor pressure of a liquid?
  5. science - chemistry

    Some heat is supplied to a mixture of ice and liquid water in a closed container and the contents of the container are thoroughly mixed. If, after the addition of heat, both ice and liquid water remain: A) the temperature of the system …
  6. chem

    A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.93 L at 25°C and 785 torr. Calculate the vapor pressure …
  7. CHEMISTRY

    if a pure liquid in a sealed container is in equilibrium with its own vapor, the dependence of the vapor pressure on the temperature and the heat of vaporization is governed by the Clausius-Clapeyron equation. what is the heat of vaporization …
  8. (1-11) Chemistry - Science (Dr. Bob222)

    Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is …
  9. Chemistry!

    Liquid A has vapor pressure X, and liquid B has vapor pressure Y. What is the mole fraction of the liquid mixture if the vapor above the solution is 30% A by moles?
  10. Organic Chemistry

    Simple Distillation: What is the molar composition of the vapor in equilibrium with a boiling liquid that has a composition of 60% A and 40% B?

More Similar Questions