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You have $100. \ ml$ of $0.20 \ M$ solution $NH_{3}$, $K_{b}(NH_{3})= 1.8 \times 10^{-5}$.

How many $mL$ of $0.30 \space M$ $HCl$ must be added to create a buffer with a $pH$ of $9.0$?

A

$0.013 \space mL$

B

$27 \space mL$

C

$43 \space mL$