Molecular
equation: AB(aq) + CD(aq) ® AD(s) + CB (aq)
Full
ionic equation: A+ (aq) + B- (aq) + C+ (aq) + D- (aq) ® AD (s) + C+ (aq) + B- (aq)
So,
the difference between molecular and full ionic equation in the case of an ion-exchange reaction
is that the aqueous salts are represented in their aqueous ionic form in the full ionic equation.
Net ionic
equation: A+ (aq) + D- (aq) ® AD(s)
The difference between a
full ionic equation and net ionic equation in the case of
ion-exchange reaction (and all other reactions as we shall see later) is that
the spectator ions are not included in the net ionic equation.
A (net) ionic equation
shows only the species that undergo chemical transformation
in the reaction.