J.R. S. answered 11/15/20
Ph.D. University Professor with 10+ years Tutoring Experience
MgCO3 is a precipitate, and all others are aqueous. So, the net ionic equation only needs to include the species involved in the precipitate. Thus, the net ionic equation would be...
Mg2+(aq) + CO32-(aq) ==> MgCO3(s)