Changing the position of equilibrium

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Changing the position of equilibrium:

Le Chatelier's principle: If a constraint is imposed on a system at equilibrium, then the system will respond in such a way as to counteract the effect of that constraint.

Concentration

  • Le Chatelier's principle predicts that if a reactant's concentration in a system is increased, the system will move to the right in order to decrease the concentration of that reactant. 
  • If the reactant's concentration is decreased, the system will move to the left in order to replace the reactant. 
  • This works with the product as well. 
  • Changing the concentrations of reactants and products has no effect on the rate constants of the forward or reverse reactions. Therefore, it has no effect on the equilibrium constant.

Pressure:

  • The pressure in a system depends on the number of gas molecules in the system. 
  • Le chatelier's principle therefore predicts that if the pressure of the system is increased, the system will move towards the side which has fewer gas moles. 
  • If the pressure of the system is decreased, the system will move towards the side which has more

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