Ionic Bonding

Introduction

Cations and anions are formed in such a way that the "OctetRule" is satisfied.
Example:
Na(s) + ½Cl2 → NaCl(s)
ΔH°r = − 410.9 Kj (highly exothermic)
Both Na and Cl in NaCl have inert gas configuration.
ionic-bonding

Energetics of Ionic Bond Formation

Definition: Lattice energy is the energy required to completely separate an ionic solid into its gaseous ions. E1 = κ(Q1Q2)/d
Where: κ is a constant = 8.99 x 109 J·m/C2, Q1 and Q2 are the charges on the ions, d is the distance between ions.

Lattice energy depends on:
Lattice energy increases as:

Exercise: Energetics of Ionic Bond Formation

Exercise on Energetics of Ionic Bond Formation

Check your answers here: Solution to the Exercise on Energetics of Ionic Bond Formation




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Date of last modification: Summer , 2019