A tablet of a common over-the-counter drug contains 200.mg of caffeine (C8H10N4O2) .What is the pH of the solution resulting from the dissolution of two of these tablets in 225.mL of water? (For caffeine, Kb = 4.1 × 10-4.)
A) 2.76
B) 7.67
C) 10.96
D) 6.33
E) 11.24
Correct Answer:
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