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The pKa of a weak acid (HA) is 4.5 The ...

The `pK_a` of a weak acid (HA) is 4.5 The pOH of an aqueous buffered solution of HA in which 50% of it is ionised is

A

4.5

B

2.5

C

9.5

D

7

Text Solution

Verified by Experts

The correct Answer is:
C
`pH=pK_(a) + "log"(["salt"])/([acid])` Since[salt]=[acid]
Hence `pH = pK_(a)`
`pOH=14-pK_(a)=9.5`
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