Buffer Solutions

Step 1: Identify the Buffer System
- The given solution consists of a weak acid ( ) and its salt ( ), forming a buffer solution.
- The pH of a buffer solution is given by the Henderson-Hasselbalch equation:

Step 2: Calculate pKa
- Given , we calculate:

Step 3: Calculate the Concentrations
- Moles of HA (Acid): - Moles of NaA (Salt): - Total Volume after Mixing: - Final Concentrations:

Step 4: Apply the Henderson-Hasselbalch Equation

Final Answer: The pH of the buffer solution is , which matches Option (3).