Chapter 15, Problem 15.55SP

Interpretation Introduction

Interpretation:

An equilibrium constant with $K_c>1$ suggests that a reaction is favoured to the right. Therefore, choose the conjugate acid-base pair that will react to shift equilibrium to the right.

Concept introduction:

• The equilibrium constant of an acid is referred to as the K_aand uses the formula: K_a= $\left[H^{+}\right]\left[A^{-}\right]/\left[HA\right]$
• The equilibrium constant of a base is referred to as the K_band uses the formula: K_b= $\left[B{H}^{+}\right]\left[O{H}^{-}\right]/\left[B\right]$
• The product of the base and acid dissociation constants provides the following formula: K_a? $K_b=1\times {10}^{-14}=K_w$

To classify:

Which conjugate acid-base pair will give $K_c>1$.