Question: ionic compounds that are not soluble in water?
Answer: Cl, Br, I: All chlorides, bromides, and iodides are soluble except those of silver, mercury, and lead (e.g., AgCl, Hg2Cl2, and PbCl2). SO42: Most sulfates are soluble. Exceptions include BaSO4, PbSO4, and SrSO4. CO32: All carbonates are insoluble except NH4+ and those of the Group 1 elements.