Weak Acids (Section)
The active ingredient in aspirin is acetylsalicylic acid (HC9H7O4), a monoprotic acid with Ka = 3.3 × 10-4 at 25 °C. What is the pH of a solution obtained by dissolving two extra-strength aspirin tablets, containing 500 mg of acetylsalicylic acid each, in 250 mL of water?
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