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This was rejected before but I'm not sure why? No information is missing . It's 400mL of .10 M KOH added. I guess that chemist couldn't piece that together . 

4. 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 400.0 mL. The Ka of HF is 3.5x10-4.
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Transcribed Image Text

4. 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 400.0 mL. The Ka of HF is 3.5x10-4.