Chapter 14, Problem 14.53SP

Interpretation Introduction

Interpretation:

The given unfilled equation with unknown conjugate acid-base pair has to be completed such that it gives equilibrium constant greater than $1$

Concept Introduction:

Position of equilibrium:

The equilibrium constant represents how far the reaction progress at given temperature.

At equilibrium, when ${\text{K}}_{\text{c}}\text{>1}$, product beats reactant and more greater than $1$ means reaction is completed.

When ${\text{K}}_{\text{c}}\text{<1}$, reactants beats product, however much less than $1$ means the reaction hardly happens at all.