No gases or anything formed. I even heated the different solutions up and solubility did not change.
I narrowed it down already to those groups. The initial amount of possible anions are:
nitrate, chloride, bromide, iodide, sulfate, sulfide, sulfite, phosphate, carbonate
The amount of possible cations are:
copper, iron, chromium, nickel, cobalt, silver, lead, bismuth, antimony, tin, aluminum, and zinc.