For an ion-exchange reaction to occur, one of the products must
be insoluble.
The difference between molecular and full ionic equations for a
precipitation reaction:
– Soluble salts appear in their dissociated or ionized (aqueous ionic)
form in the full ionic equation. All other reagents are the same in
both equations.
The difference between full ionic and net ionic equations for a
precipitation reaction:
– Spectator
ions—the aqueous ions that remain aqueous at the end of the reaction— appear
in the full ionic equation but do not appear in the net ionic equation.
– Note again that a spectator ion(s)
is(are) always an aqueous ion(s).