Chapter 4, Problem 4.31P

Interpretation Introduction

Interpretation:

The position of equilibrium in given acid base reaction has to be predicted.  Also, the equilibrium constant ${\text{K}}_{\text{eq}}$ of the reaction using ${\text{pK}}_{\text{a}}$ values has to be calculated.

Concept Introduction:

Position of equilibrium in acid-base reaction:

In an acid-base reaction, the position of equilibrium always favors reaction of the stronger acid and stronger base to form the weaker acid and weaker base. Therefore, the major species present at equilibrium in an acid-base reaction are weaker acid and weaker base.  The reaction equilibrium shifts to a direction where weaker acid and weaker base is formed.  Acids with greater ${\text{pK}}_{\text{a}}$ values are weak acids and base with greater ${\text{pK}}_{\text{b}}$ values are weaker base.