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RAOULT’S LAW & HENRY’SLAW

CHE 698Russell Mahmood

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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

 

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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

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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;

 

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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,

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R lt’ L & H ’ L

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Raoult’s La, & Her)’s La'ressure

o- asolut!o

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solet

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Raoult’s La, & Her)’s LaRe!eren"es:

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