Can anyone help me on this chemistry question and explain how they got the answer?

Question

Aqueous solutions of sodium carbonate and magnesium nitrate are mixed together.

A) Write a complete ionic equation for this reaction, showing charges on all ions.

Answer 1

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Sodium carbonate in solution consists of Na+ ions and CO3^2- ions. Magnesium nitrate is Mg2+ and NO3^- ions. Magnesium carbonate, on the other hand, is insoluble in water.

2Na+ + CO3^2- + Mg2+ + 2NO3^- --> MgCO3(s) + 2Na+ + 2NO3^-

The net ionic equation only contains Mg2+ and CO3^2- since Na+ and NO3^- are spectator ions.

Mg2+ + CO3^2- --> MgCO3(s)

Answer 2

2Na^+ + CO3^2- + Mg^2+ + 2NO3^- → 2Na^+ + 2NO3^- + MgCO3

For this, you have to learn what charges are on the ions, and you need to know that magnesium carbonate is insoluble, and therefore will remain together.