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Chayan Banerjee from kendriya vidyalaya ballygunge, asked a question
Subject: Chemistry , asked on 19/11/11

 what is the difference between Qc and kc.

EXPERT ANSWER

Shukla Paladhi , Meritnation Expert added an answer, on 25/11/11
1143 helpful votes in Chemistry

Reaction Quotient Q c - It is the function of the activities or concentrations of the species involved in a chemical reaction.

For a general reaction,

 

Thus it is the ratio of product of concentrations of the products and product of concentrations reactants, each concentration raised to the power equal to stoichiometric coefficient in the balanced equation at any stage of reaction .


Equilibrium constant K c- The ratio of product of concentrations of the products and product of concentration reactants, each concentration raised to the power equal to stoichiometric coefficient in the balanced equation at only equilibrium stage of reaction .

 

Reaction Quotient Q c pridicts the direction of reaction.

When Q c < K c : Reaction proceeds in forward direction

Q c > K c : Reaction proceeds in backward direction

Q c = K c : Reaction is in equilibrium

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