A buffer system is set up with [HA] = 2[A^-]. If pK_a = 5.5, what is the pH of the buffer?

Name: A buffer system is set up with [HA] = 2[A - ]. If pK a = 5.5, what is the pH of the buffer?
Brand: Quizplus
Rating: 4.8 (55 reviews)

Question

Quizplus · Accepted Answer

The correct answer is A because the pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). In this case, the pKa is 5.5 and the ratio of [A-] to [HA] is 2:1. Plugging these values into the equation gives a pH of 5.2.

A Buffer System Is Set Up with [HA] = 2[A-]

A Buffer System Is Set Up with [HA] = 2[A^-]