Question

Write the balanced NET ionic equation for the reaction when CaBr₂ and Na₃PO₄ are mixed in aqueous solution. If no reaction occurs, simply write only NR.

Answer 1

I assume you meant when AQUEOUS solutions of those salts are mixed.
balanced molecular equation:
3CaBr2(aq) + 2Na3PO4(aq) ==> Ca3(PO4)2(s) + 6NaBr(aq)
total ionic:
3Ca^2+(aq) + 6Br^-(aq) + 6Na^+(aq) + 2[PO4]^3-(aq) ==> Ca3(PO4)2(s) + 6Na^+(aq) + 6Br^-(aq)
net ionic: Cancel ions that appear on both sides. The remainder is the net ionic equation:
3Ca^2+(aq) + 2[PO4]^3-(aq) ==> Ca3(PO4)2(s)