Codeine (C18 H21 NO3) is a weak organic base. A 5.0 ×10^-3 M solution of codeine has a pH of 9.9

step 1 Problem 76 part A. We know that POH equals to 14 minus 9 .95 that is equals to 4 .05. Now, conce

Codeine (C18 H21 NO3) is a weak organic base. A 5.0 ×10^-3 M...

Codeine $\left(\mathrm{C}_{18} \mathrm{H}_{21} \mathrm{NO}_{3}\right)$ is a weak organic base. A $5.0 \times 10^{-3} \mathrm{M}$ solution of codeine has a pH of 9.95. Calculate the value of $K_{b}$ for this substance. What is the $\mathrm{p} K_{b}$ for this base?

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Key Concepts

Weak Organic Base

A weak organic base only partially reacts with water to form its conjugate acid and hydroxide ions, establishing an equilibrium. This limited ionization in solution is central to understanding its basic behavior and influences how its dissociation constant (Kb) is determined.

Base Dissociation Constant (Kb)

Kb is a quantitative measure of the extent to which a weak base ionizes in water. It represents the equilibrium concentration ratio of the products (conjugate acid and hydroxide ions) to the reactant (the un-ionized base) and is a key parameter in establishing the basicity of the substance.

pKb and Its Relationship to Kb

pKb is the negative logarithm of the base dissociation constant (Kb) and provides a more convenient way to express the strength of a weak base. It is directly related to the Kb value, where a larger pKb indicates a weaker base. Understanding this relationship allows one to calculate the strength of a base using measured pH values of its solution.

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