Complete and balance the precipitation reactions. Include physical states in your equations.

Question

Ba(NO3)2(aq) + CuSO4 (aq)--->

K3PO4(aq)+MgCl2 (aq)---->

Answer 1

Didn't I do this for you a couple days ago? You need to know the solubility rules. Here is a simplified set.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

The first one is done this way.
Ba(NO3)2(aq) + CuSO4((aq) ==> BaSO4(s) + Cu(NO3)2(aq)