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CHEMICAL
EQUILIBRIUM
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CHEMICAL
EQUILIBRIUM
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citycollegiate.com
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| Reversible reactions proceed in both directions simultaneously. In a reversible reaction a state is acxhieved at which the rate of forward reaction becomes equal to the rate of backward reaction. This state is referred to as 'chemical equilibrium'. | ||||
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EXPLANATION
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Consider
a reversible reaction A
+ B  C
+ D in which two reactants A and B are allowed to react
together. |
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At initial stage the reaction proceeds in the forward direction only because
no product is formed. |
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As the reaction starts A and B reacts to form C and
D . Now C and D react each other to reproduce A
and B and the reaction now proceeds in both forward and backward
directions but the rate of forward reaction and the rate of backward reaction
are different. |
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citycollegiate.com
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Finally a state is established at which the rate of backward reaction becomes
equal to the rate of forward reaction. This state is called 'chemical
equilibrium'. |
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| At
equilibrium state, the reaction does not stop. Reactants form products and
products again converted into reactants. This process is always continue
but with the passage of time, there is no change in the concentration of
reactants and products due to same rate of reaction. At this point, it apparantely
appears as the reaction has stopped because we don't see any change in the
concentration of reactants and products with time. Since chemical equilibrium continues and never go to stop, therefore, chemical equilibrium is a dynamic equilibrium. |
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