Determine the pH during the titration of 56.9 mL of 0.385 Mhydrofluoric acid (Ka = 7.2×10-4) by 0.385 M NaOH at the followingpoints.
(a) Before the addition of any NaOH
(b) After the addition of 14.0 mL of NaOH
(c) At the half-equivalence point (the titration midpoint)
(d) At the equivalence point
(e) After the addition of 85.4 mL of NaOH
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