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

A weak acid HA after treatment 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 26.6 ml .what is the value `K_a` acid ?

`1.8xx10^(-5)`

`8.12xx10^(-6)`

`1.8xx10^(-6)`

`8.2xx10^(-5)`

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