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14 years ago
Jose Martinez

pH problem...............?

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 extra strength aspirin tablets, containing 598 mg of acetylsalicylic acid each, in 277mL of water? pH=
Top 1 Answers
14 years ago
Dr.A
Favorite Answer
mass = 598 x 2 = 1196 mg => 1.196 g moles = 1.196 g / 180.157 g/mol =0.00664 Initial concentration = 0.00664 / 0.277 L=0.0240 M 3.3 x 10^-4 = x^2 / 0.0240-x x = [H+]= 0.00281 M pH =2.55
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