In our discussion of the titration between a weak base and a strong acid, we're now looking at calculations after the equivalence point. Now when we get to the equivalence point and beyond, we no longer have a buffer, it's been completely destroyed.
So in this case though, we're going to say since we're after the equivalence point, we're going to say in this part of the titration the moles of weak base is less than the moles of strong acid. Here we're going to say there will be an excess strong acid remaining after it has neutralized the weak base.
Now this is a good thing because if you have excess of a strong species, it becomes that much more easy to determine the overall pH of the solution. Because remember, strong species ionize completely, so there would be no need for an ice chart.