CBSE Class 11-science Answered
Define and explain the law of chemical equilibrium.
Asked by Topperlearning User | 16 Jun, 2016, 05:17: PM
Expert Answer
The law of chemicalequilibrium states that in a reversible reaction the ratio of the rate of the forward reaction to the rate of the reverse reaction is a constant for that reaction at a constant temperatuere.
For a general chemical reaction
a A + b B 
c C + d D
c C + d DAccording to the law of mass action : rf =kf [A]a [B]b and rb = kb[C]c [D]d
At equilibrium point , rf = rb
Or,kf [A]a [B]b = kb[C]c [D]d Or, kf/ kb = KC
|
KC =
|
[C]c [D]d
 [A]a [B]b |
Where Kc is the equilibrium constant and the notation [A] signifies the molar concentration of species A. An alternative expression for the equilibrium constant for reaction involving gaseous substances ( concentration expressed in partial pressure) is as below
|
KP =
|
PCc PDd
PAa PBb |
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