The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffer solution of HA in which 50% of the acid is ionized is:
2.5
5.9
9.5
6
Let us consider the dissociation equilibrium of the acid
Writing the expression for the equilibrium constant
When the acid is 50% dissociated,
Hence, the correct answer is Option (3)
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