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Buffer solution problem: Calculate the pH of a solution that is 0.30 M in HF and 0.15 M in NaF? ...?

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MissPhiladelphia

For the question given above, I think there is a lack of information such as choice of answer for this question. Here is the solution for the question:
pKa = 3.14 
pH = pKa + log [F-] / [HF]
      = 3.14 + log 0.15 / 0.30
       = 2.84

pH is 2.84. I hope this answer helps.

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