raoults & henry's law
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7/21/2019 Raoults & Henry's Law
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RAOULT’S LAW & HENRY’SLAW
CHE 698Russell Mahmood
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Heater U!t
Rea"tor
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12/10/15
Redu"e #ressure+) o#e!$ the"a
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Ideal Solution Assumption:• T,o t)#es o- mole"ules are radoml)
d!str!+uted• Mole"ules are assumed to +e s!m!lar ! s!.e
ad sha#e• /termole"ular -or"es ! #ure l!0u!ds & m!1ture
are s!m!lar• E1am#les2 +e.ee & toluee3 he1ae ad
he#tae
Raoult’s La, & Her)’s La
Ideal Gas Assumption:• Mole"ules o""u#) .ero s#a"e
• 4ero mole"ular !tera"t!o
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Raoult’s La, & Her)’s La
Raoult’sLa,
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A*solute7
(*solet7
A
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Raoult’s La, & Her)’s La
Raoult’s Law:
• :es"r!+es the +eha!or o- solets "ota!!$ a small olumsolute;
• The a#or #ressure o- a "om#oet A ! a solut!o at tem#ee0ual to the #rodu"t o- the mole -ra"t!o o- A ! solut!o a#ressure o- #ure A at tem#erature T;
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Raoult’s La, & Her)’s La
<a#or L!0u!dE0u!l!+r!um
<a#or L!0u!dE0u!l!+r!um
<a#or L!0u!dE0u!l!+r!um
Saturat#ressursolet
NR
l
l
Solute*soletmole"ules arestro$l) +oded thasolet*solet
Solute*soletmole"ules are lessstro$l) +oded thasolet*solet
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Raoult’s La, & Her)’s La
<a#or L!0u!dE0u!l!+r!um
Saturat#ressursolet
<a#or L!0u!dE0u!l!+r!um Raoult
law
Solute*soletmole"ules are e0uall)stro$l) +oded asthe solet*soletmole"ules
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Raoult’s La, & Her)’s LaExample #1 (Raoult’s Law): /- =;>?= mol o- a ooele"trol)te are d!ssoled ! >;== mol o- ,ater3 ,haa#or #ressure o- the result!$ solut!o@ The a#or ##ure ,ater !s >;8 torr at ;= BC;7
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Raoult’s La, & Her)’s La
Henry’s Law:
• :es"r!+es the +eha!or o- a solute ! a d!lute solut!o;
• Sates that the amout o- $as d!ssoled ! a solut!o !s d!re"#ro#ort!oal to the #art!al #ressure o- the $as;
l
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Raoult’s La, & Her)’s La
Soletmole"ulessurroud solute;
The!r ee"t"aot +e!$ored
Solutemole"ule
R l ’ L & H ’ L
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Raoult’s La, & Her)’s La
R lt’ L & H ’ L
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Raoult’s La, & Her)’s La
uestion:/ a t)#!"al L soda +ottle3 the #art!al #ressure o- CO !s a+o
the Her)’s La, "ostat 7 -or ! ,ater at 98 D !s 9;? 3 ,"o"etrat!o o- ! the soda@Answer:
R lt’ L & H ’ L
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Raoult’s La, & Her)’s La
Raoult’sLa,
Her)’sLa,
R lt’ L & H ’ L
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Raoult’s La, & Her)’s La'ressure
o- asolut!o
'ressure-rom
solet
Cal"ulateus!$
Raoult’sLa,
'ressure-rom
solute
Cal"ulateus!$
Her)’sLa,
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Raoult’s La, & Her)’s LaRe!eren"es:
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