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Calculating the pH Change in a Buffer Solution

CHEM-69GJBM

Calculate the pH of the resulting solution if $3.0\text{ mL}$ of $0.20\text{ M } HCl$ is added to a $50.0\text{ mL}$ solution containing $0.050\text{ M } {CH}_{3}COOH$ and $0.050\text{ M }{CH}_{3}{COO}^{-}$.

${K}_{a}=1.75\times {10}^{-5}\text{ for } {CH}_{3}COOH$

A

$\text{pH}=2.4$

B

$\text{pH}=1.9$

C

$\text{pH}=5.0$

D

$\text{pH}=4.5$