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A tablet of a common over-the-counter drug contains 400. mg of caffeine (C8H10N4O2) (MM=194.1906 g/mol). What...

A tablet of a common over-the-counter drug contains 400. mg of caffeine (C8H10N4O2) (MM=194.1906 g/mol). What is the pH of the solution resulting from the dissolution of a tablet in 225. mL of water? (For caffeine, Kb = 4.1 × 10–4.)

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