(Prelim) Exp 3 Boiling Point Determination (Prelab Discussion)

Question 1

Temperature at which the vapor pressure of the liquid is equal to the pressure of the gas above it (or atmospheric pressure)

Answer 1

Boiling Point

Question 2

Dependent on the applied pressure and the intermolecular force of attraction between the liquid particles

Answer 2

Boiling Point

Question 3

Boiling points are determined for two reasons:

Answer 3

1. Used to characterize a new organic liquid
2. Knowledge of the boiling point helps to compare one organic liquid to another as in the process of identifying an unknown substance

Question 4

1. Using a Bunsen burner, prepare 8 capillary tubes by sealing one end.
2. Place 5 drops of the sample into the bulblet/vaccine tube and place the sealed capillary tube into the bulblet containing the sample with the sealed end topmost.
3. Attach the bulblet to the thermometer with a ring of rubber tubing around 3cm above the tip of the bulb or the capillary tube inside the
   bulblet is at the same level as the thermometer bulb.
4. Immerse the setup on an oil bath.
5. Increase the temperature of the bath gradually until a rapid and continuous stream of bubbles comes out of the capillary tube and passes through the liquid sample.
6. Remove the heat and allow the bath to cool by stirring continuously.
7. Take note of the temperature at the instant the bubbles cease to come out of the capillary tube and just before the liquid enters it.

Answer 4

Procedure in Boiling Point