Calculate the pH of a buffer that is 0.032 M HF and 0.032 M NaF.The K_a for HF is 3.5 × 10^-4. A) 2.86 B) 9.31 C) 10.54 D) 3.46 E) 4.79

Question

Quizplus · Accepted Answer

To calculate the pH of a buffer solution, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log [base]/[acid]

In this case, HF is the acid and NaF is the conjugate base. The pKa of HF is given as 3.5 × 10-4.

Substitute the values:

pH = 3.5 × 10-4 + log (0.032/0.032)

pH = 3.5 × 10-4 + log 1

pH = 3.5 × 10-4 + 0

pH = 3.46

Therefore, the correct choice is D - 3.46.

Calculate the PH of a Buffer That Is 0