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A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of hydrofluoric acid is 3.5x10^-4. a) 10.83 b) 10.17 c) 3.17 d) 7.00 e) 8.17