1.

The `pK_(a)` 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 isA. 4.5B. 2.5C. 9.5D. `7.0`

Answer» Correct Answer - C
For buffer solution
`pH = pK_(a) + log.(["Salt"])/(["Acid"]) = 4.5 + log.(["Salt"])/(["Acid"])`
as HA is 50% ionized so [Salt] = [Acid]
pH = 4.5
pH + pOH = 14
`rArr pOH = 14 - 4.5 = 9.5`.


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