
Lauren H. answered 03/25/19
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Li2CO3(aq) + MgCl2(aq) → MgCO3(s) + 2LiCl(aq)
2Li+ + CO3 -2 + Mg2+ + 2Cl- → Mg2+ + CO3 -2 + 2Li+ + 2Cl-
CO3 -2 + Mg2+ → MgCO3(s) net
The Li+ and Cl- are spectator ions