|
Observations
|
Possible Cations
|
white residue or
white deposits |
Compounds of Gp
I, II and III metals.
Ammonium salts.
Residue is likely to be oxides of Gp I, Gp II and
Gp III metals formed. |
| Black powdery residue |
Copper(II) compounds,
iron(II) compounds.
Residue is likely to be CuO, FeO |
Yellow residue
when hot,
white residue when cold. |
Zinc compounds;
residue is zinc oxide. |
| Solid changes colour
from green to black powder residue. |
Solid is Copper(II)
carbonate.
CuO residue formed. |
| Black residue from
charring, usually with burning odour |
Organic compound
present; residue is carbon. |
