What is the net ionic equation for the reaction between sodium carbonate, and zinc nitrate?
Well, zinc carbonate is fairly insoluble so..............
What becomes of the acetate and potassium ions?
How did I know that zinc carbonate was insoluble? How else by learning it by rote?
You will be given such a scheme, and the exceptions, and I suggest you learn them. You will also do these sorts of partner exchanges reactions in the lab.