Chapter 15, Problem 15.80QE

(a)

Interpretation Introduction

The chemical equation corresponding to ionization of pyridinium ion has to be written and acid ionization constant has to be calculated.

Concept Introduction:

The ionization of a hypothetical weak acid $\left(\text{HA}\right)$ is given as follows:

  $\text{HA}\left(\text{aq}\right)+{\text{H}}_{\text{2}}\text{O}\left(\text{l}\right)\rightleftharpoons {\text{A}}^{-}\left(\text{aq}\right)+{\text{H}}_3{\text{O}}^{+}\left(\text{aq}\right)$

The relation among $K_{\text{a}}$, ${\text{K}}_{\text{b}}$ and $K_{\text{w}}$ is given as follows:

  $K_{\text{a}}{K}_{\text{b}}=K_{\text{w}}$

Here,

$K_{\text{w}}$ denotes the ionic product of water.

$K_{\text{a}}$ denotes ionization constant of weak acid.

$K_{\text{b}}$ denotes ionization constant of the conjugate base of the weak acid.

(b)

Interpretation Introduction

The chemical equation corresponding to ionization of hydrazinium ion has to be written and base ionization constant has to be calculated.

Concept Introduction:

The relation among $K_{\text{a}}$, $K_{\text{b}}$ and $K_{\text{w}}$ is given as follows:

  $K_{\text{a}}{K}_{\text{b}}=K_{\text{w}}$

Here,

$K_{\text{w}}$ denotes ionic product of water.

$K_{\text{a}}$ denotes ionization constant of weak acid.

$K_{\text{b}}$ denotes ionization constant of the conjugate base of the weak acid.