Chapter 7, Problem 87E

Interpretation Introduction

Interpretation: The ${\text{K}}_{\text{b}}$ value of p-toluidine needs to be determined, if the pH of 0.0160 M aqueous solution is 8.60.

Concept Introduction: A base is the substance that gives ${\text{OH}}^{\text{-}}$ ions in its aqueous solution. On the basis of base dissociation, they can be classified as strong and weak base. A strong base is ionized completely and gives the respective ions.

  ${\text{BOH}}_{\text{(aq)}}\stackrel{}{\to }{\text{B}}^{+}{}_{\text{(aq)}}+{\text{OH}}^{\text{-}}{}_{\text{(aq)}}$

On the contrary, a weak base ionized partially and reaches to equilibrium.

  ${\text{B}}_{\text{(aq)}}{\text{ + H}}_{\text{2}}{\text{O}}_{\text{(aq)}}\rightleftharpoons {\text{ HB}}^{\text{+}}{}_{\text{(aq)}}{\text{ + OH¯}}_{\text{(aq)}}$