What is the pH of a buffer?
Understand the Problem
The question is asking about the pH of a buffer solution, which involves understanding the components of buffers, their concentration, and the Henderson-Hasselbalch equation used to calculate pH in buffered systems.
Answer
The pH of a buffer is determined by the equilibrium constant (Ka) of the weak acid and the ratio of the weak base [A-] to weak acid [HA] using the Henderson-Hasselbalch equation.
The pH of a buffer is determined by two main factors: the equilibrium constant (Ka) of the weak acid and the ratio of the concentration of the weak base [A-] to the weak acid [HA] in solution. This is typically calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]).
Answer for screen readers
The pH of a buffer is determined by two main factors: the equilibrium constant (Ka) of the weak acid and the ratio of the concentration of the weak base [A-] to the weak acid [HA] in solution. This is typically calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]).
More Information
Buffers are important for maintaining a stable pH in biological and chemical systems, allowing reactions to occur at optimal rates.
Tips
A common mistake is using incorrect concentration values for [A-] and [HA], leading to inaccurate pH calculations. Always ensure these values are measured correctly.
Sources
- Calculating pH of Buffer Solutions- Henderson-Hasselbalch equation - chem.libretexts.org
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