Determine the pH of the solution after the

Question
A 100.0. mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 100.0 mL of KOH. The Ka of HF is 3.5 × 10-4.
You answered one of my questions earlier today and did a fantastic job. I was hoping you could show me how to do this one.