Now, it's very important to understand the following point. Catalysts do not, and I repeat, do not affect the equilibrium of reaction. In other words, what catalysts do is they speed up their forward reaction and reverse reaction. But the final concentrations of our product and reactions remain the same. In other words, let's look at this uncannyze and catalyze reaction. Again, suppose that the concentration and equilibrium of our uncatalyzed are as following we have concentration of A, we have concentration of B and construction of our product AB.