1)Which cations should form soluble sulfate compounds from (Sodium, calcium, silver, copper 2)?

Question

2) which anions should form precipitates with barium ions from (sulfate, carbonate and iodide?)

3) which anions should form precipitates with silver ions? Write net ionic equations for the reactions.

Answer 1

http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html