Hydrofluoric acid has a Ka of 6.6 x 10-4. 40.00 mL of 0.150 M sodium fluoride, NaF, is titrated against 0.125 M HBr.  Give the pH at these four points: initial, 32.00 mL of acid have been added, at the equivalence point, and when 60.00 mL have been added.

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