The active ingredient in aspirin is acetylsalicylic acid, HC 9 H 7 O 4 , a monoprotic acid with K a = 3.3 x 10 -4 at 25C.

The active ingredient in aspirin is acetylsalicylic acid, HC9H7O4, a monoprotic acid with Ka = 3.3 x 10-4 at 25°C. What is the pH of a solution obtained by dissolving two aspirin tablets, each containing 325 mg of acetylsalicylic acid in 100. mL of water?

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