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Kb of codeine

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Codeine, C18H21NO3, a commonly prescribed painkiller, is a weak base. A saturated aqueous solution contains 1.00 g codeine in 120 mL of solution and has a pH = 9.8. What is the Kb of codeine?
C18H21NO3 + H2O <----> [C18H21NHO3]^+ + OH^- Kb = ?

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