1.0 L solution is prepared by mixing 61 ...

1.0 L solution is prepared by mixing 61 g benzoic acid `(pK_(a)=4.2)` with 72 g of sodium benzoate and then 300 mL 1.0 M HBr solution was added. The pH of final solution is :

`3.6`

`3.8`

`4.2`

`4.8`

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