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Question

What are the applications of equilibrium constant?


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Solution

The equilibrium constant (KC) for a reaction has the following applications :

  • On the basis of the value of the equilibrium constant, it is possible to predict the direction of a chemical reaction. Depending upon the relative values of and QC, the direction of a chemical reaction can be predicted where QC is the reaction quotient. (reaction quotient is the ratio of the molar concentration of the reactants to the products at any stage of the reaction.)

If QC=KC, then the reaction is at equilibrium.

If QC>KC, then the reaction proceeds in the backward direction.

If QC<KC, then the reaction proceeds in the forward direction.

  • On the basis of the value of the equilibrium constant, the extent to which a chemical reaction takes place can be known. A greater value of KC implies that the reaction proceeds towards the products and the yield of the products will be more while a lower value of KC indicates the lesser yield of products.
  • KC values help in the calculation of the equilibrium concentrations of various substances in the reaction.

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