Adding a catalyst to a reversible reaction at equilibrium:

1. A catalyst provides an alternative route with a lower activation energy. 2. That route is available to the forward and the reverse reaction alike. 3. So both rates increase by the same factor and remain equal to one another. 4. Equilibrium is therefore reached sooner, but at exactly the same position. 5. The equilibrium constant depends only on temperature, so a catalyst cannot change it either. _Source: NECTA ACSEE 2023 Chemistry 132/1, Question 8: Chemical Equilibrium_