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A 23.9 mL sample of a 0.331 M aqueous hydrofluoric acid solution is titrated with a 0.458 M aqueous barium hydroxide solution. What is the

A 23.9 mL sample of a 0.331 M aqueous hydrofluoric acid solution is titrated with a 0.458 M aqueous barium hydroxide solution. What is the pH at the start of the titration, before any barium hydroxide has been added?

pH =

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