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

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4.5

2.5

9.5

7.0

answer is C.

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Detailed Solution

For buffer solution :pH = pKa + log SaltAcid = 4.5 + log SaltAcid As HA is 50% ionized so Salt = Acid pH = 4.5 pH + pOH = 14 ∴ pOH = 14 - 4.5 = 9.5

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