Question

How would the graph change if a catalyst were used?

Answer 1

The addition of a catalyst increases the rate of a reaction by providing an alternative reaction pathway that requires less activation energy.

... This means that the addition of a catalyst can increase the rate at which a reaction will reach equilibrium.

However, the catalyst lowers the activation energy for both the forward and the reverse reactions, ...so the catalyst will have no effect on the equilibrium position of a system.