A 1.50 L buffer solution is 0.250 mol L^-1 in HF and 0.250 mol L^-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The K_a for HF is 3.5 × 10^-4. A) 3.34 B) 3.46 C) 3.57 D) 3.63 E) 2.89

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Quizplus · Accepted Answer

The pH of the buffer solution can be calculated using the Henderson-Hasselbalch equation. After adding NaOH, the moles of HF decrease by 0.0500, and the moles of F⁻ increase by 0.0500. The new concentrations are used in the equation: pH = pKa + log([F⁻]/[HF]).

A 150 L Buffer Solution Is 0