Posted by Boo Boo on Wednesday, November 21, 2012 at 11:33am.
You need to learn (read that memorize) the solubility rules. Here is a simplified set.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
For a I know that Ag3PO4 is insoluble.
The net ionic equation is
3Ag^+(aq) + PO4^-(aq) ==> Ag3PO4(s)
For b I know that K2CO3 and Na2SO4 are soluble.
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