At room temperature and pressure, compound X exists as a crystalline solid. An aqueous solution of X is examined as follows. Test results: • Acidify with dilute nitric acid, then add aqueous barium nitrate: no observable change. • Add aqueous ammonia: a white precipitate forms, which dissolves in excess. What is a possible identity of X?
- Aammonium carbonate
- Bsodium sulfate
- Ccalcium nitrate
- Dzinc chloride