The effectiveness or capacity of a buffer solution can be affected by
A.molar concentration of the buffer components
B. concentration of the conjugate base to the weak acid
C. both (a) and (b)
D. temperature of buffer components
Answers
The effectiveness or capacity of a buffer solution can be affected by(B) concentration of the conjugate base to the weak acid
Explanation:
1.The Henderson-Hasselbalch equation is pH=pKa+log([A−][HA]) In this equation, [HA] and [A⁻] refer to the equilibrium concentrations of the conjugate acid–base pair used to create the buffer solution.
2.A higher buffer concentration has a greater buffer capacity. This means that a greater amount of hydrogen ions, or a stronger acid, would have to be added to disrupt the equilibrium and change the pH of the buffer.
3. Buffer capacity is also affected by the relative concentrations of the buffer components.
4.While the ratio of [A-]/[HA] influences the pH of a solution, the actual concentrations of A- and HA influence the effectiveness of a buffer.
5. The more A- and HA molecules available, the less of an effect addition of a strong acid or base will have on the pH of a system.