What’s the molecular and net ionic equation?

Question

Complete and balance the molecular equation for the reaction of aqueous chromium(II) bromide, CrBr₂, and aqueous sodium carbonate, Na₂CO_3.

Answer 1

Cr (II)

Br (I)

Na (I)

CO₃ (II)

Molecular Equation: CrBr₂(aq) + Na₂CO₃(aq) → CrCO₃(s) + 2NaBr(aq)

Complete Ionic Eq.: Cr²⁺(aq) + 2Br^1-(aq) + 2Na⁺(aq) + CO₃^2-(aq) → CrCO₃(s) + 2Na⁺(aq) + 2Br^1-(aq)

The bolded ions will be cancelled out on both sides

Net Ionic Equation: Cr²⁺(aq) + CO₃^2-(aq) → CrCO₃(s)

Answer 2

Molecular: CrBr₂(aq) + Na₂CO₃(aq) ===> CrCO₃(s) + 2NaBr(aq)

Net ionic: Cr²⁺(aq) + CO₃^2-(aq) ==> CrCO₃(s) The Na⁺ and Br^- are spectator ions.