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  Dependence of dissociation constant

Dependence of dissociation constant with formation equilibrium constant:

In the formation of equilibrium reaction, reactants and products are written at the LHS and RHS of the equilibrium sign correspondingly. For similar reaction, the dissociation equilibrium comprises of the products in the place of reactants and reactants in the place of products being written at LHS and RHS of the equilibrium sign correspondingly.

In such conditions, the equilibrium constant of the dissociation equilibrium reaction that is also termed as the dissociation constant, is found to be the reciprocal value of the equilibrium constant for the formation equilibrium reaction. For illustration, consider the formation equilibrium reaction of SO3, from SO2 and O2 gases,

2SO2(g) + O2(g)  ↔ 2SO3(g)

The equilibrium constant, Kc, is specified by.

2302_dissociation constant.jpg

 In dissociation equilibrium reaction of SO3, the reactants become products and vice-versa.
2SO3(g) ↔ 2SO2(g) + O2(g)

The equilibrium constant of dissociation equilibrium K ′, specified by,

197_dissociation constant2.jpg

Kc′ is considered as the dissociation constant of SO3 gas. Generally, the equilibrium constant of dissociation equilibrium is the reciprocal of equilibrium constant of the formation of equilibrium reaction.

 

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