Chapter 16, Problem 75QP

Interpretation Introduction

Interpretation:

From the given diagrams of weak base systems, the one with the highest value of ${\text{K}}_{\text{b}}$ and the one with the lowest value of ${\text{K}}_{\text{b}}$ are to be determined.

Concept introduction:

The ionization of the weak base takes place as:

${\text{B}}_{\left(\text{aq}\right)}+{\text{H}}_2{\text{O}}_{\left(\text{l}\right)}\rightleftharpoons {\text{BH}}^{\text{+}}{}_{\left(\text{aq}\right)}+{\text{OH}}^{-}{}_{\left(\text{aq}\right)}$

${\text{K}}_{\text{b}}$ is the measure of ionization of a base and is known as the base-ionization constant, which is specific at a particular temperature.

${\text{K}}_{\text{b}}=\frac{\left[{\text{BH}}^{+}\right]\left[{\text{OH}}^{-}\right]}{\left[\text{B}\right]}$ …… (1)