Identifying Cations - Test with Chloride Ions

  1. Out of the 10 cations, only lead(II) ions will form a precipitate with chloride ions.
  2. This is because lead(II) chloride is insoluble in water.
  3. The chemical reaction is a double decomposition reaction.
    Pb2+ + 2Cl- → PbCl2
  4. Lead(II) chloride will dissolve in hot water.


HCl or NaCl
Na+
-
Ca2+
-
Mg2+
-
Al3+
.-
Zn2+
-
Pb2+
White precipitate.
Dissolve in hot water
Fe2+
-
Fe3+
-
Cu2+
-
NH4+
-

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