A Tablet of a Common Over-The-Counter Drug Contains 200

question 126

Multiple Choice

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, K_b = 4.1 × 10^-4.)

• A)2.76
• B)7.67
• C)10.96
• D)6.33
• E)11.24

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