Chapter 2, Problem 2.51P

Interpretation Introduction

Interpretation: An explanation regarding the correct choice of $\text{p}{K}_{\text{a}}$ values for the given ammonium cations is to be stated.

Concept introduction: According to Bronsted-Lowry theory, when an acid donates a proton the species formed is known as conjugate base and when the base accepts a proton the species formed is known as conjugate acid.

The equilibrium constant of an acid dissociation reaction depends on the strength of an acid involved in the reaction. The $K_{\text{a}}$ value is large for strong acids and small for weak acids. The stronger acid has a lower value of $\text{p}{K}_{\text{a}}$ and the weaker acid has a higher $\text{p}{K}_{\text{a}}$ value.