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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 buffer solution of HA in which 50% of the acid is ionized is

A

7

B

4.5

C

2.5

D

9.5

Text Solution

Verified by Experts

The correct Answer is:
D
For acidic buffer, `pH =pK_a+log ""([A^(-)])/([HA])`
When the acid is 50% ionised `[A^(-)]=[HA]`
`pH=pK_a+log 1 rArr pH=pK_a`
Given `pK_a=4.5 therefore 4.5 therefore pOH =14-4.5=9.5`
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