What is the pH of a buffer solution that is 0.255 M in hypochlorous acid (HClO)and 0.333 M in sodium hypochlorite? The K_a of hypochlorous acid is 3.8 × 10^-⁸. A) 13.88 B) 6.46 C) 8.49 D) 7.30 E) 7.54

Question

Quizplus · Accepted Answer

The correct answer is E.The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation:```pH = pKa + log([A-]/[HA])```where:* pKa is the negative logarithm of the acid dissociation constant (Ka)* [A-] is the concentration of the conjugate base* [HA] is the concentration of the acidIn this case, the acid is hypochlorous acid (HClO) and the conjugate base is hypochlorite ion (ClO-). The Ka of hypochlorous acid is 3.8 × 10^-8.```pH = -log(3.8 × 10^-8) + log([ClO-]/[HClO])``````pH = 7.54```

What Is the PH of a Buffer Solution That Is