We get ka times the concentration of conjugate acid. This guy divided by the concentration of conjugate base for this guy equals the hydronium concentration. Now our next step is to convert these guys into logs because our PH involves logs. So we take the logs of both sides and we get log of base ten of the hydronium concentration of this guy equals log of base ten of this whole guy. Now our next goal is to use the laws of logs to convert this guy from this more compact state to a less compact state. Now, what we get is the following log of the hydronium concentration.