A weak acid HA after teratment with 12 m...

A weak acid HA after teratment with 12 mL of `0.1M` strong base BOH has a pH of 5. At the end point, the volume of same base required is `26.6mL.K_(a)` of acid is:

`1.8xx10^(-5)`

`8.22xx10^(-6)`

`1.8xx10^(-6)`

`8.2xx10^(-5)`

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