Final answer:
The Henderson-Hasselbalch equation is used to calculate the pH of a buffer solution.
Step-by-step explanation:
The Henderson-Hasselbalch equation is a rearranged version of the equilibrium constant expression. It provides a direct way to calculate the pH of a buffer solution using the formula pH = pKa + log([base]/[acid]). The Henderson-Hasselbalch equation is commonly used in chemistry to determine the pH of buffer solutions, which are solutions that resist changes in pH when small amounts of acid or base are added. This equation is commonly used to understand and predict how changes in the concentrations of the weak acid and its conjugate base affect the pH of a buffer solution.