When 24.7 mL of a 0.500 M aqueous hydrofluoric acid solution is titrated with a 0.477 M aqueous potassium hydroxide solution....?

Update: When a 24.7 mL sample of a 0.500 M aqueous hydrofluoric acid solution is titrated with a 0.477 M aqueous potassium hydroxide solution, what is the pH at the midpoint in the titration?
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