Chapter 12, Problem 12.4QP

Interpretation Introduction

Interpretation:

The wide range of solubility of ionic compounds in water has to be explained.

Concept Introduction:

• Solubility of an ionic compound is primarily influenced by – lattice energy, hydration energy and ion-dipole interaction.
• The energy released when gaseous state ions of unlike charges that are infinitely farther apart combine to form a stable ionic solid is called Lattice energy.  Conversely, the energy required to break the electrostatic force of attraction between the ions of unlike charges in the ionic solid and revert them to gaseous state is also termed as Lattice energy of an ionic solid.
• Hydration energy refers to the quantity of energy released when one mole of ion gets hydrated at constant pressure.  Hydration energy of an ion depends upon its ionic size.
• Ion-dipole attraction is the attractive force between ion (from the solute) and a dipole (from polar solvent).