01-03-2013, 12:50 PM
Two Component System
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PHASE
It denoted by ‘P’ it is defined as homogenous physically distinct and mechanically separated part of heterogeneous system in equilibrium.
Eg :CaCO3(s) CaO(s) + CO2(g)
COMPONENT ©:
Number of components of a system at equilibrium is defined as minimum number of molecular species in terms of which composition of all the phases are expressed.
Degree of freedom(F)
It is defined as minimum number of variables such as temperature, pressure, composition, which are required to define a system at equilibrium .
TWO COMPONENT SYSTEM
“When two components constitute smallest number by means of which the composition of each phase can be expressed, it is known as two component system”.
Types of two component system:
Solid-Gas system
Solid-Liquid system
Liquid-Liquid system
HYDRATE FORMATION(CuSO4-H2O)
Experiment-
Powder crystals of CuSO4.5H2O are kept in vessel which is provided with pressure gauge.
Vessel is kept in thermostat at constant temperature of 500C.
Water vapors in vessel is removed by means of a pump.
Rehydration of anhydrous CuSO4
When anhydrous CuSO4 is taken in evacuated vessel, its pressure will be zero corresponds to point G
Now if we add some water vapour, the vapour pressure will along GF
At the point F monohydrate beings to formed, if we add more water to system.
Pressure remains constant along EF until at anhydrous salt is changed into monohydrate.