A buffer is prepared by combining 25 mL of 0.50 M NaF(aq)with 25 mL of 0.25 M HCl.What is the pH of the buffer? (K_a (HF)= 6.9 × 10−⁴)

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Quizplus · Accepted Answer

The buffer solution consists of HF and NaF. The moles of NaF and HCl are equal, so all HCl reacts with NaF to form HF. Using the Henderson-Hasselbalch equation, pH = pKa + log([F-]/[HF]), where [F-] = [HF] = 0.125 M, pH = 3.16.

A Buffer Is Prepared by Combining 25 ML of 0