Codeine, C₁₈H₂₁O₃N, is an opiate, has analgesic and antidiarrheal properties, and is widely used. In water, codeine is a weak base. A handbook gives pK_a = 6.05 for protonated codeine, C₁₈H₂₁O₃NH⁺. Write the reaction for C₁₈H₂₁O₃NH⁺ and calculate pK_b for codeine.

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H C H HO Н Codeine N-CH3