Question

What net ionic equation describes the reaction when these solutions are mixed?

Na3PO4 (aq) + CaCl2(aq) →

Na+(aq) + Cl– (aq) → NaCl(s)

2Ca2+(aq) + Na+(aq) → NaCa2(s)

2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)

2PO43–(aq) + Cl– (aq) → Cl2(PO4)3(s)

Answer 1

Net ionic reaction: 2PO₄³⁻(aq) + 3Ca²⁺(aq) → Ca₃(PO₄)₂(s).

Answer 2

Balanced chemical reaction:
2Na₃PO₄(aq) + 3CaCl₂(aq) → 6NaCl(aq) + Ca₃(PO₄)₂(s).
Ionic reaction:
6Na⁺(aq) + 2PO₄³⁻(aq) + 3Ca²⁺(aq) + 6Cl⁻(aq) → 6Na⁺(aq) + 6Cl⁻(aq) + Ca₃(PO₄)₂(s).
Net ionic reaction: 2PO₄³⁻(aq) + 3Ca²⁺(aq) → Ca₃(PO₄)₂(s).
(aq) means that substances are dissociated on cations and anions in water.
(s) means solid.