Determination of Boiling Point.

The boiling Point of a liquid is the corrected temperature at which the vapour pressure of the liquid reaches 101.3 kPa.

Method :

Place in the flask 20 ml of the liquid being examined, add a few pieces of porous material and heat rapidly to boiling. 

Record the temperature at which liquid beings to run from the side arm into the condenser.

Correct the temperature reading for the effect of barometric pressure using the following expression:

t₁ = t₂ + K (101.3 – b)

 

Where,

  t₁ = the correct temperature

  t₂ = the measured temperature

  B  = the barometric pressure in kPa at the time of the determination

  K = the correction factor