JEE Main 2007 Chemistry question
The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is
Answer: (3)
Solution
At 50% ionisation , so pH = pKa = 4.5 (Henderson equation) and pOH , option (3). 4.5 is the pH, not the pOH.