what is the difference between Qc and kc.

Reaction Quotient Qc- 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 Kc- 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 Qcpridicts the direction of reaction.

When Qc < Kc: Reaction proceeds in forward direction

Qc >Kc: Reaction proceeds in backward direction

Qc = Kc: Reaction is in equilibrium

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