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Chemical Equilibrium - Lecture Notes | CHEM 1200, Study notes of Chemistry

Material Type: Notes; Professor: Thomas; Class: General Chemistry II; Subject: Chemistry; University: Auburn University-Montgomery; Term: Unknown 1989;

Typology: Study notes

Pre 2010

Uploaded on 08/16/2009

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Chemical
Chemical Chemical
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Equilibrium
EquilibriumEquilibrium
Equilibrium
Chapter 15
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ChemicalChemicalChemicalChemical

EquilibriumEquilibriumEquilibriumEquilibrium

C

hapter 15

Chemical Chemical

Chemical Chemical Equilibrium

EquilibriumEquilibriumEquilibrium

Chemical reactions normallygo from reactants to products

A

B

º

AB

When they do not go tocompletion

equilibrium

Chemical Chemical

Chemical Chemical Equilibrium

EquilibriumEquilibriumEquilibrium

A system where rates of forwardand reverse reactions are the sameAt equilbrium, no observablechanges occurSystem remains in equilbrium ifundisturbedSystem must be closed

Chemical Chemical

Chemical Chemical Equilibrium

EquilibriumEquilibriumEquilibrium

H

2

O (l)

ºººº

H

2

O (s)

Physical equilibrium

N

2

  • 3 H

2

ºººº

2 NH

3

Chemical equilibrium

Equilibrium Equilibrium

Equilibrium Equilibrium reactions

reactionsreactionsreactions

equilibrium arrow

N

2

  • 3 H

2

ºººº

2 NH

3

TheTheTheThe haber

haberhaberhaber process

process

process process

Friz Haber

(1868-1935)

N

2

+ 3 H

2

2 NH

3

K

C

D

A

B

c

c

d

a

b

[

] [

]

[

] [

]

Equilibrium Equilibrium

Equilibrium Equilibrium expression

expressionexpressionexpression

In general:

aA

+ bB

cC + dD

Need balanced equation

K

C

D

A

B

c

eq

c

eq

d

eq

a

eq

b

[

]

[

]

[

]

[

]

Equilibrium Equilibrium

Equilibrium Equilibrium constant

constantconstantconstant

aA

+ bB

cC + dD

K

c

used for molarities.

Solutions

Closed vrs. Open system

No

EquilibriumEquilibriumEquilibriumEquilibrium constant

constantconstantconstant

Units for K varyK varies with temperature

K independent of initialconcentrations

k

k

K

f

r

c

=

EquilibriumEquilibriumEquilibriumEquilibrium constant

constantconstantconstant

Relationship between Rates and K

At equilibrium

rate

f

= rate

r

Q

C

D

A

B

c

d

a

b

[

] [

]

[

] [

]

ReactionReactionReactionReaction quotient

quotientquotientquotient

Same equation as K

c

aA

+ bB

cC + dD

Q can be measured at anypoint in the reaction

CCCCalculations

alculationsalculationsalculations

Predicting reaction direction Q

K

reactants

WWWW

products until

equilibrium reached

CCCCalculations

alculationsalculationsalculations

Predicting reaction direction Q < Kreactants

products

until Q = K"shifts to right"