Think about a double displacement reaction. The products could be NaClO4(aq) and CaCO3 which will form a precipitate. So, the net ionic reaction will be Ca2+(aq) + CO32-(aq) --> CaCO3(s)
In most of these kinds of questions, you have to be able to predict what could happen. Then, you recognize what ions will remain in solution (spectator ions). Your net ionic equation then includes only those things that change their state in the reaction.
Answers & Comments
Verified answer
Think about a double displacement reaction. The products could be NaClO4(aq) and CaCO3 which will form a precipitate. So, the net ionic reaction will be Ca2+(aq) + CO32-(aq) --> CaCO3(s)
In most of these kinds of questions, you have to be able to predict what could happen. Then, you recognize what ions will remain in solution (spectator ions). Your net ionic equation then includes only those things that change their state in the reaction.