Slow and fast rate of Chemical Reaction

RATE OF CHEMICAL REACTIONS


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EQUILIBRIUM CONSTANT AND EXTENT OF A CHEMICAL REACTION



       It has been found experimentally that at a particular temperature, when equilibrium is achieved, the ratio between the concentration of products and reactants becomes constant. This can be represented with the help of following formula:

the number of moles of the solute present in one liter of solution is Molarity

Example:- In reaction

N2 (g) +3H2 (g)           2NH3 (g)

In chemical reactions the Molarity of a reactant or a product is represented by putting its symbol or formula within a square bracket, [ ]

       Here the concentration of each term [NH3], [N2] and [H2], is raised to the power equal to the stoichiometric coeffient and Kc is called equilibrium constant.

Importance of equilibrium constant Kc: Magnitude of equilibrium constant Kc indicates the extent of a chemical reaction. Larger the value of Kc, higher will be the concentration of products at equilibrium. Smaller value of Kc indicates the lower concentration of the products at equilibrium.