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In a reaction at equilibrium, what effect does adding an inert gas at constant v

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Question: In a reaction at equilibrium, what effect does adding an inert gas at constant volume have?

Options:

  1. Shifts the equilibrium to the right
  2. Shifts the equilibrium to the left
  3. No effect on the equilibrium
  4. Increases the reaction rate

Correct Answer: No effect on the equilibrium

Solution: 

Adding an inert gas at constant volume does not change the partial pressures of the reactants or products, thus having no effect on the equilibrium position.

In a reaction at equilibrium, what effect does adding an inert gas at constant v

Practice Questions

Q1
In a reaction at equilibrium, what effect does adding an inert gas at constant volume have?
  1. Shifts the equilibrium to the right
  2. Shifts the equilibrium to the left
  3. No effect on the equilibrium
  4. Increases the reaction rate

Questions & Step-by-Step Solutions

In a reaction at equilibrium, what effect does adding an inert gas at constant volume have?
  • Step 1: Understand what equilibrium means. In a chemical reaction at equilibrium, the rates of the forward and reverse reactions are equal.
  • Step 2: Know what an inert gas is. An inert gas is a gas that does not react with the substances in the reaction.
  • Step 3: Recognize that adding an inert gas at constant volume means you are increasing the total pressure of the system without changing the amounts of reactants or products.
  • Step 4: Remember that the partial pressure of a gas is the pressure it would exert if it occupied the entire volume alone. Adding an inert gas does not change the amounts of reactants or products, so their partial pressures remain the same.
  • Step 5: Conclude that since the partial pressures of the reactants and products do not change, the equilibrium position is not affected by the addition of the inert gas.
  • Le Chatelier's Principle – The principle that states if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust to counteract that change.
  • Inert Gas Effect – Understanding that adding an inert gas does not affect the equilibrium position because it does not participate in the reaction and does not change the partial pressures of the reactants or products.
  • Equilibrium Constant – The constant that expresses the relationship between the concentrations of reactants and products at equilibrium, which remains unchanged when an inert gas is added at constant volume.
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