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pH of a Benzoic Acid/Benzoate Buffer Solution

CHEM-KRNDX9

A buffer is prepared from $100 \ mL $ of $0.20 \ M$ benzoic acid and $100 \ mL $ of $ 0.20 \ M$ benzoate.

What is the pH of the buffer?

$K_{a}$ (benzoic acid) = $6.3 \times 10^{-5}$

A

$4.2$

B

$6.3$

C

$7.0$

D

$9.8$