This document discusses phase diagrams and the phase rule. It defines key terms like phase, component, and degree of freedom. It then explains how to apply the phase rule to one, two, and three component systems. For a three component system, the degree of freedom is given by F=C-P+2 or F=5-P. The document also discusses types of three component phase diagrams, including ones that show the formation of one, two, or three pairs of partially miscible liquids. An example system of water, phenol, and aniline is given that forms three pairs of partially miscible liquids.

1. Guided by Presented by
Dr.Laxmi Tantuvay Gayatri Muchhala

3. PHASE
COMPENT
DEGREE OF FREEDOM

4.  any homogeneous distinct part of a system
which is mechanically separable and
bounded by a definite
surface
 example:-ice (s)=H2O
 water(l)=H2O
 Vapour(g)=H2O

5. The smallest number of independently
variable constituent by means of which the
composition of each can be represent by
means of a chemical equation
 Ex.. In water vapour and ice system .there is
only one component present in this because
H and O can not varied independently so it is
a one component system

6.  The number of variable factor such as
temperature pressure or concentration
which must be arbitraly fixed in order to
define the system completely
 Example:-a gases mixture of two gases C02
and N2 in equilibrium to defined this
system three variable viz, composition
(35%co and 65% N2)temp. 40degree and
pressure 760mm are required to be
arbitrarily fixed hence the system has three
degree of freedom

7.  One component system
 Two component system
 Three component system

8.  Phase rule for one component system
 F=C-P+2
 F=1-P+2
 F= 3- P
 Here maximum degree of freedom can be
only 2

9.  Phase rule when apply in two component
system
 F=C-P+2
 F=2-P+2
 F= 4 – P
 Here maximum degree of freedom is three

10. According to phase rule ,the degree of freedom in
a three component system in three component
system is given by,
F=c-p+2
F=3-p+2
F = 5+ P
point at which all the phases are stable together is
known as quintuple point

11.  The variation in concentration of the three
component mixture is expressed by means of
triangular diagram The representation of
compositions in a three-component

13.  Formation of one pair of partially miscible
liquids.
 Formation of two pairs of partially miscible
liquid
 Formation of three pairs of partially miscible
liquids

17.  System of water, phenol ,aniline

18. Formation of three pairs of partial
miscible liquid