Test with Iodide Ions
- Iodide ions will form precipitate with lead(II) ions and copper(II) ions.
- However, in SPM you only need to know the reaction between lead(II) ions and iodide ions.
- The yellow precipitate formed will dissolve in hot water.
Pb2+ + 2I– → PbI2
KI | |
Na+ | – |
Ca2+ | – |
Mg2+ | – |
Al3+ | – |
Zn2+ | – |
Pb2+ | Yellow precipitate. Dissolve in hot water |
Fe2+ | – |
Fe3+ | A red brown solution formed. |
Cu2+ | White precipitate form in brown solution |
NH4+ | – |