A 440.0 mL sample of 0.20 M HF is titrated with 0.10 M LiOH. Determine the pH of the solution after the addition of 440.0 mL of LiOH. The Ka of HF is 6.8 × 10-4. A) 3.47 B) 4.15 C) 2.87 D) 1.94 E) 3.17 I've reworked this problem and I keep getting 2.87 and it is not right then I tried the inverse log and got 3.47 and that was not correct either so please help me out

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.