General Chemistry

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Determining pH of Aspirin Dissolved in Water

CHEM-8KBMAN

Aspirin, $\textrm{HC}_9\textrm{H}_7\textrm{O}_4$, is a weak acid. The acid dissociation constant for aspirin is $3.0 \times 10^{-4}$. Each tablet contains $150 \textrm{ mg}$. Assume no interaction from any other compounds contained in the tablet.

What is the $pH$ of a solution in which two tablets of aspirin are dissolved in $250.0 \textrm{ mL}$ of water?

A

1.7

B

2.9

C

3.1

D

3.2

E

5.7