Let's look at the Henderson Hasselblack formula or equation. Now, if you don't know what this formula is, check out the link above. So, this equation states that PH is equal to PKA of our acid plus log of this ratio the concentration of the conjugate base over the concentration of the conjugate acid. And this PH is the PH of our buffer system. So notice that since this guy equals this guy, this divided by this is one. So what's inside here is simply one.