Codeine, C18H26O3N is the active ingredient in the sedative Paregoric™ and is a weak Brønsted base with Kb = 8.9 x 10–7 (conjugate acid is C18H26O3NH+).To a 20.00 mL sample of 0.0155 M aqueous solution of Codeine is added 9.75 mL of 0.0180 M HCl(aq).a) Calculate the pH of the above solution.b) To the above solution is added 1.00 mL of 0.0150 M NaOH(aq). Calculate the new pH that results and the % change in pH.Show your work and justify any approximations made.

A solution involving weak alkali with conjugate salt is addressed as "alkaline buffer solution". On…

Answered: Codeine, C18H26O3N is the active…

Chemistry & Chemical Reactivity

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Codeine, C₁₈H₂₆O₃N is the active ingredient in the sedative Paregoric™ and is a weak Brønsted base with K_b = 8.9 x 10^–7 (conjugate acid is C₁₈H₂₆O₃NH⁺).

To a 20.00 mL sample of 0.0155 M aqueous solution of Codeine is added 9.75 mL of 0.0180 M HCl(aq).

a) Calculate the pH of the above solution.
b) To the above solution is added 1.00 mL of 0.0150 M NaOH(aq). Calculate the new pH that results and the % change in pH.

Show your work and justify any approximations made.

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