Determine the pH of a 0.22 mol L^-1 NaF solution at 25 °C. The K_a of HF is 3.5 × 10^-5. A) 10.20 B) 5.10 C) 8.90 D) 11.44 E) 2.56

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NaF is a salt of a strong base (NaOH) and a weak acid (HF). In solution, F⁻ acts as a base. Use Kb = Kw/Ka to find Kb, then use the formula for pH of a basic solution: pH = 14 - pOH. Calculate pOH from [OH⁻] = √(Kb × [F⁻]). The pH is approximately 8.90.

Determine the PH of a 0