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What is the pH of 1.00 L sample of a buf...

What is the pH of 1.00 L sample of a buffer solution containing 0.10 mol of benzoic acid and 0.10 mol of sodium benzoate of which 0.010 mol of NaOH has been added ?
[`K_a` benzoic acid=`6.5xx10^(-5)`]

A

4.27

B

4.23

C

4.15

D

`4.10`

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