So, in order to get the net ionic equation, we consider only the ions that reacted in the total ionic equation. We use these ions to get the net ionic equation.
Examining the total ionic equation provided, we will find that the only ions that reacted are the 2fe3+(aq) and the 3co32– (aq) ions which reacted together forming fe2(co3)3(s).
Based on this, the net ionic equation will be:
2Fe3+ (aq) + 3CO32- (aq) -----> Fe2(CO3)3 (s)
