What is the pH of a solution prepared by mixing 100.mL of 0.0500 M HCl with 300.mL of 0.500 M HF? [K_a(HF)= 7.1 × 10^-4] A)1.47 B)1.90 C)1.30 D)1.63 E)2.82

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Quizplus · Accepted Answer

The solution is a mixture of a strong acid (HCl) and a weak acid (HF). The concentration of HCl is 0.0125 M after dilution, and HF is 0.375 M. The pH is mainly determined by the strong acid, HCl, but HF also contributes. Using the Henderson-Hasselbalch equation for HF and considering the contribution of HCl, the pH is approximately 1.63.

What Is the PH of a Solution Prepared by Mixing