So I can use the KB to find the amount of base needed to neutralize our acid completely. And then if I know my concentration of base, I could find the poh. And using the poh, I can find the PH. And that's exactly what we do. So in my second step, I basically use the KB or the base annette and constant. I equate that to my equilibrium expression, which states that the concentration of hydroxide, what I'm looking for, equals the concentration of the conjugate acid over the concentration of the conjugate base.