Question

Select the correct option if pH=pKa in the Henderson-Hasselbalch equation?

• A. [HA]=[A-]
• B. [HA]>[A-]
• C. [HA]<[A-]
• D. [HA]=log[A-]

Answer 1

Answer:

A. [HA]=[A-]

Definition: The Henderson-Hasselbalch equation, pH = pKa + log([A–]/[HA]), can be used to calculate the pH of a buffer. -The equilibrium concentrations of the conjugate acid-base pair used to create the buffer solution are denoted by [HA] and [A–] in this equation. -When [HA] = [A–], the pH of the solution equals the pKa of the acid.