The effect of applied pressure on vapor pressure

1
The effect of applied pressure on vapor pressure
2
The location of phase boundaries
Pressure and temperature at which two phases can
coexist.
There is a relation between dp and dT that
ensures that the system remains in equilibrium as
either variable is changed.
3
Relation between dp and dT
4
The solid liquid boundary
5
Liquid Vapour boundary
6
Solid-Vapour Boundary
1 bar
7
Phase Rule
FC-P2
C number of component
8
Total number of intensive variable pc 2 Mole
fraction of components in each phase must be
one Number of relation number of phases p For
chemical equilibrium, Chemical potential of
individual component will be same in each of the
phases. In each of the component (p-1) relation
for each of the component Total number of
relation for chemical equilibrium c(p-1) Degree
of Freedom pc 2 p - c(p-1) c p 2
9
(No Transcript)
10
What happens to boiling point or freezing point
of a liquid in the presence of a solute?
What happens to chemical potential of a liquid in
the presence of solute?
11
There is elevation of boiling point upon addition
of a solute.
There is depression of freezing point upon
addition of a solute.
12
The elevation of boiling point
13
(No Transcript)
14
(No Transcript)
15
The depression of Freezing point
Solubility
Solutes with high melting points and large
enthalpies of melting have low solubilities at
normal temperature.
16
Two component liquid Systems
FC-P2 F4-P Maximum degree of freedom
3 Temperature, pressure and composition.
17
(No Transcript)
18
(No Transcript)
19
Q. One mole of benzene is mixed with two moles
of toluene. At 60 C , the vapor pressure of
benzene and toluene are 51.3 and 18.5 kPa,
respectively. (a) As the pressure is reduced, at
what pressure will boiling begin? (b) What will
be the composition of the first bubble of vapor?
20
(No Transcript)