zinc sulfide ==> solid (insoluble) cobalt(II) carbonate ==> solid (insoluble) lead nitrate ======. aq (soluble) Please refer the solubility chart. most of the carbonate and sulphide salt are insoluble whereas nitrate salt are soluble) Solution zinc sulfide ==> solid (insoluble) cobalt(II) carbonate ==> solid (insoluble) lead nitrate ======. aq (soluble) Please refer the solubility chart. most of the carbonate and sulphide salt are insoluble whereas nitrate salt are soluble).