Two of the following ions depend on their conversion into a gas for detection. What are the 2 ions? The two ions will form an ionic compound. What are the formulas and name of the compound? Na+ K+ Ca2+ Fe3+ NH4+ Cl- Br- I- PO43- SO42- CO32- Two of the following ions depend on their conversion into a gas for detection. What are the 2 ions? The two ions will form an ionic compound. What are the formulas and name of the compound? Na+ K+ Ca2+ Fe3+ NH4+ Cl- Br- I- PO43- SO42- CO32- Solution I- and NH4+.