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50 ml of a weak acid , HA , required ...

50 ml of a weak acid , HA , required 30 ml `0.2` M NaOH for the end point . During titration , the pH of acid solution is found to be 5.8 upon addition of 20 ml of the above alkali . The `pK_(a)` of the weak acid is

A

`6.3 `

B

`5.5`

C

`6.1`

D

None of these

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