And this base and this acid are conjugate acid base pairs. So notice that one member of a conjugate acid base pair is always found on one side, while the second member of the conjugate base pair is always found on the other side of the equation. You'll never find both members on one side. For example, this guy and this guy are found on different sides. And this guy and this guy are found different sides, just like this acid and this new base are found on different sides. And this base and this acid are found on different sides, so this always holds true.