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General Chemistry

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Moderate

Calculation of pH of Methylamine Buffer from $K_b$ Value

CHEM-ZREOII

What is the $pH$ of a solution that is prepared by mixing $100.0 \textrm{ mL}$ of $0.250 \textrm{ M}$ methylamine ($\textrm{CH}_3\textrm{NH}_2$) and $250.0 \textrm{ mL } 0.170 \textrm{ M}$ $\textrm{CH}_3\textrm{NH}_3\textrm{Cl}$?

The $K_b$ of methylamine is $3.70\times10^{-4}$.

A

3.43

B

10.4

C

10.6

D

10.8

E

11.7