Chapter 6, Problem 6.98SP

Interpretation Introduction

Interpretation:

The expected order of lattice energies of $\text{LiCl}$, $\text{KCl}$, $\text{KBr}$, ${\text{MgCl}}_{\text{2}}$ should be determined.

Concept introduction:

Amount of energy required either to break or to form an ionic solid is called lattice energy. It is represented by $\text{U}$. It depends on the charges of the constituent ions and their ionic radii. Higher value of ionic charges results in greater lattice energy and vice-versa.

The expression for lattice energy is as follows:

$U=\frac{k{z}_1{z}_2}{d}$

Where,

• $U$ is the lattice energy.
• $k$ is a constant.
• $z_1$ and $z_2$ are the ionic charges.
• $d$ is the distance between the ions.