Chapter 6, Problem 6C.4E

(a)

Interpretation Introduction

Interpretation:

The ${\text{pK}}_{\text{b}}$ value for the given bases from ${\text{K}}_{\text{b}}$ value has to be determined.

Concept Introduction:

The strength of proton accept of a base is called basicity constant and also the basicity constant is said to be as their negative logarithms and which can be represented as follows,

    ${\text{pK}}_{\text{b}}\text{=}{\text{-logK}}_{\text{b}}$

When looking for the strength of acids and bases the following points should be noted,

• Weak acid always have the smaller value of ${\text{K}}_{\text{a}}$ and has greater value of ${\text{pK}}_{\text{a}}\text{.}$
• Weak base always have the smaller value of ${\text{K}}_{\text{b}}$ and has greater value of ${\text{pK}}_{\text{b}}\text{.}$

(b)

Interpretation Introduction

Interpretation:

The given bases in order of increasing strength have to be arranged.

Concept Introduction:

Refer to part (a).