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Effect Of Change In Concentration And Pressure On Equilibrium

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Effect Of Change In Concentration And Pressure On Equilibrium - Lesson Summary

The factors that influence equilibrium are:

  • Concentration
  • Pressure
  • Temperature
  • Catalyst


a) When a system at equilibrium is disturbed by the addition or removal of any reactant or product, Le Chatelier's principle predicts that the position of equilibrium shifts in the direction in which this change is reduced or nullified.

b) In general, increasing the concentration of any one of the reactants always favours the forward reaction.

c) Removing or decreasing the concentration of any one of the reactants always favours the backward reaction.

d) Adding a product to the equilibrium mixture results in the backward reaction.

e) Removing a product from the equilibrium mixture results in the forward reaction.

Ex: In the given example increasing the concentration of reactants or decreasing the cocnentration of products will favors forward reaction. And increasing concentration of products favors backward reaction.

N2(g)   +    3H2(g) ⇌  2NH3(g)
1 mole      3 moles        2moles

f) Pressure has no effect on reactions in which there is no change in the number of moles of the reactants and products.

g) According to the Le Chatelier principle, when a system at equilibrium is subjected to change in pressure, then the system tends to shift the equilibrium position in such a direction that the effect is nullified.

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