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

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