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A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH.

A)What is the pH after 20.0 mL of the 0.10 M NaOH is added? Show all calculations.

I think I answered this for you yesterday. Use the Henderson-Hasselbalch equation.

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