SLIDE 1
OBJECTIVES
T
- determine saturation temperature of a
liquid at a set pressure.
T
- determine Antoine constants (A,B)
T
- determine latent heat of vaporization.
DETERMINATION OF VAPOUR PRESSURE TAs Utsab Mukherjee (123020004) - - PowerPoint PPT Presentation
DETERMINATION OF VAPOUR PRESSURE TAs Utsab Mukherjee (123020004) - - PowerPoint PPT Presentation
TH 202 EBULLIOMETRIC DETERMINATION OF VAPOUR PRESSURE TAs Utsab Mukherjee (123020004) Bharath Ravu (134024001) Maanya Gaur(134024002) Staff: Nirmal Karangale OBJECTIVES T o determine saturation temperature of a liquid at a
SLIDE 2
SLIDE 3
THEORY
Boiling point: the temperature at which
vapor pressure of the liquid becomes equal to the ambient pressure and liquid turns into vapor.
The dependence of vapor pressure of the
liquid at a given temperature is given by Clausius-Clapeyron equation ΔHv: enthalpy
- f vaporization
SLIDE 4
Experimental set up
SLIDE 5
Sample Observations
Correction factor = 63 mm Hg
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Sample Observations
10 20 30 40 50 60 70 80 90 10 20 30 40 50 60
T emperature(deg C)
Time(mins)
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Questions
- 1. Using temperature measurements how do
you know whether the system has reached equilibrium or not?
- 2. How to make sure from the drop rate count
that the liquid is not in a super-heated or sub- cooled state? (do this only at 760 mm Hg)?
- 3. Determine the correlation constants in the
vapour pressure equation. Estimate latent heat
- f vaporization and compare to literature.
SLIDE 8
Questions
- 4. Is the set pressure equal to total pressure
- r vapour pressure of the liquid? Will this
affect calculated latent heat of vaporization?
- 5. How can this experiment and the
calculation methods be improved?
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Safety measurements
Don’t increase the rheostat voltage
- excessively. It may lead to very fast
generation vapor causing poor
- condensation. Finally vapor can deposit as
liquid in the manometer.
Don’t go below vacuum pressure of 250
mm Hg. It may lead to the abovementioned problem.
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