Qualitative Analysis & Tests for Ions
CationFe2+
Observationgreen precipitate
Soluble in excess NaOHNo
- Test Ca2+ with a few drops of NaOH — confirm a white precipitate forms
- Find the cation that gives a BLUE precipitate with NaOH
- Find a cation whose white precipitate DISSOLVES when NaOH is added in excess
- Confirm that Fe3+'s red-brown precipitate does NOT dissolve, even in excess NaOH
- Test NH4+ — confirm no precipitate forms, but ammonia gas is produced instead