Identifying Cations - Test with Iodide Ions

  1. Iodide ions will form precipitate with lead(II) ions and copper(II) ions.
  2. However, in SPM you only need to know the reaction between lead(II) ions and iodide ions.
  3. 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+
-

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