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A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the...

A 100.0 mL sample of 0.20 M HF is titrated with 0.10 M KOH. Determine the pH of the solution after the addition of 200.0 mL of KOH. The Ka of HF is 3.5 × 10-4.

Answer: 8.14 but how do I get this?? I'm so lost!

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