A 250 ML Sample of 0 $K _ { a }$

question 66

Multiple Choice

A 25.0 mL sample of 0.150 mol L^-1 hydrofluoric acid is titrated with a 0.150 mol L^-1 NaOH solution.What is the pH before any base is added? Hydrofluoric acid is monoprotic.The $K _ { a }$ of hydrofluoric acid is 3.5 × 10^-4.

• A)2.33 × 10^-3
• B)2.63
• C)3.46
• D)7.07 × 10^-3
• E)2.15

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