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Nature of reactants and/or products

The value of equilibrium constant depends on the nature of reactants and products. By changing reactant(s) or product(s) of a reaction, the equilibrium constant of the reaction changes.

Temperature

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  • When ΔH is positive (endothermic reactions), an increase in temperature (T2 > T1) will make KT2 > KT1, i.e., the reaction goes more in the forward direction, and with decrease in temperature, the reaction goes in the reverse direction.
  • When ΔH is negative (exothermic reactions), an increase in temperature (T2 > T1) will make KT2 < KT1, i.e., the reaction goes in the reverse direction, and with decrease in temperature, the reaction goes in the forward direction.

Stoichiometry of the equilibrium reaction

The value of KP and Kc depends on the stoichiometry of reaction since the law of mass reaction makes use of the given stoichiometric coefficients of the reaction.
 
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Thus, in general if an equilibrium reaction is multiplied by n, the equilibrium constant of the new reaction would become nth power of the equilibrium constant of the old reaction. Therefore,
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Mode of writing a chemical equation

The values of KP and Kc also depend on the method of representing a chemical equation.
 
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