phasediagram 2015
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Phase DiagramsA Description of phase diagrams.
See the presentations:Phases
Daltons lawfor some background information.
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Phase Diagrams
In the discussion of Raoultslaw, the vapor pressure of
water at 50EC was used.From the CRC* handbookgave this vapor pressure:
From this one can see thatthe vapor pressure of waterat 50EC is:
142.60 torr
*Handbook of Chemistry and Physics, C. D. Hodgman, R. C. Weast and S. M. Shelby, eds.,Chemical Rubber Publishing Co. Handbook, 40th ed. (1958) Cleveland, OH
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One could plot this data, temperature as theabscissa and pressure as the ordinate:
Temperature /
C
Phase Diagrams
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One could plot this data, temperature as theabscissa and pressure as the ordinate:
Temperature /
C
Phase Diagrams
This line
represents the
equilibrium:
H2O(l) H2O(g)
(l) /liquid(g)/gas
(s)/
solid(aq) /aqueous
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One could plot this data, temperature as theabscissa and pressure as the ordinate:
Temperature /
C
Phase Diagrams
This line
represents the
equilibrium:
H2O(l) H2O(g)
and it is called theliquid-gas phaseboundary
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There is another line on this diagram that couldbe drawn.
Temperature /
C
Phase Diagrams
This line
represents the
equilibrium:
H2O(s) H2O(l)
recall that:(l) /liquid(s)/solid
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This line
represents the
equilibrium:
H2O(s) H2O(l)
and it is called thesolid-liquid phaseboundary
There is another line on this diagram that couldbe drawn.
Phase Diagrams
Temperature /
C
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Temperature /
C
At the low end of this diagram are another features.
Phase Diagrams
Temperature /
C
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Temperature /
C
Phase Diagrams
At the low end of this diagram are another features.
This line
represents the
equilibrium:
H2O(s) H2O(g)
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Temperature /
C
Phase Diagrams
At the low end of this diagram are another features.
This line
represents the
equilibrium:
H2O(s) H2O(g)
and it is called thesolid-gas phaseboundary
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Temperature /
C
Phase Diagrams
At the low end of this diagram are another features.
This intersection
represents the
3- way equilibria:
H2O(s) H2O(g)
H2O(l)
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Temperature /
C
Phase Diagrams
At the low end of this diagram are another features.
This intersection
represents the
3- way equilibria:
H2O(s) H2O(g)
H2O(l)
it is called the
triple point
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Phase Diagrams
At the high end of this diagram there is a point atwhich the liquid and the gas density becomes thesame.
This point is calledthe critical point
Temperature /
C
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Temperature /
C
Phase Diagrams
At the high end of this diagram there is a point atwhich the liquid and the gas density becomes thesame.
This point is calledthe critical point.
Above this pointthe fluid is referredto as the super-critical fluid.
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Phase Diagrams
Temperature /
C
liquid
gas
solid
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Temperature /C
liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Temperature /Csolid-gas boundaryCO2(s) CO2(g) liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Temperature /Csolid-gas boundaryCO2(s) CO2(g) liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
liquid-solid boundaryCO2(s) CO2(l)
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Temperature /C
triple pointCO2(s) CO2(l) CO2(g)
solid-gas boundaryCO2(s) CO2(g)
liquid-solid boundaryCO2(s) CO2(l)
liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Temperature /
C
critical point
triple pointCO2(s) CO2(l) CO2(g)
solid-gas boundaryCO2(s) CO2(g)
liquid-solid boundaryCO2(s) CO2(l)
liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
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Phase Diagrams
Other compounds have similar phase diagrams.Here is the phase diagram for CO2.
Temperature /C
critical point
supercritical fluid
triple pointCO2(s) CO2(l) CO2(g)
solid-gas boundaryCO2(s) CO2(g)
liquid-solid boundaryCO2(s) CO2(l)
liquid-gas boundary CO2(s) CO2(g)
liquid
gas
solid
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phase
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phase
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phase
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phasesolid-liquid phase boundary ( solidliquid )
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phasesolid-liquid phase boundary ( solidliquid )solid-gas phase boundary ( solidgas )
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phasesolid-liquid phase boundary ( solidliquid )solid-gas phase boundary ( solidgas )liquid-gas phase boundary ( liquidgas )
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phasesolid-liquid phase boundary ( solidliquid )solid-gas phase boundary ( solidgas )liquid-gas phase boundary ( liquidgas )
triple point ( solid
liquid
gas )
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phasesolid-liquid phase boundary ( solidliquid )solid-gas phase boundary ( solidgas )liquid-gas phase boundary ( liquidgas )
triple point ( solid
liquid
gas )critical point
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Phase Diagrams
Summary - All metals and molecular solids whichdo not decompose and many ionic solids havesimilar phase diagrams with the following features:
solid phaseliquid phasegas phase
solid-liquid phase boundary ( solidliquid )solid-gas phase boundary ( solidgas )liquid-gas phase boundary ( liquidgas )
triple point ( solid
liquid
gas )critical pointsupercritical fluid
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The End of Phase Diagrams
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