Hello MyRank Viewers, here are Some Important Qualitative Analysis Tests and Results
1. CHARCOAL CAVITY TEST:
Residue |
Metallic Bead |
Inference |
Yellow when hot, white when cold |
Zn2+ |
|
Brown when hot, yellow when cold |
Green bead, Makes the paper black |
Pb2+ |
No characteristics residue |
Red beads / scales |
Cu2+ |
White residue, glows on heating |
Ba2+/ Sr2+/ Ca2+/ Mg2+ |
|
Black residue |
Nothing definite. |
2. COBALT NITRATE TEST:
Metal |
Coloured mass |
Colour |
Zn |
ZnO.CoO |
Rinmann’s Green |
Al |
Al2O3.CoO |
Blue |
Mg |
MgO.CoO |
Pink |
Sn |
SnO.CoO |
Bluish Green |
3. FLAME TEST:
Colour of flame |
Inference |
Crimson Red |
Li |
Golden Yellow |
Na |
Violet |
K |
Brick Red |
Ca |
Dark Crimson Red |
Sr |
Apple Green |
Ba |
Green with Blue centre |
Cu |
Note: Be, Mg do not give flame test because s are too strongly bounded to be excited.
4. BORAX BEAD TEST (Only for Coloured Salts):
Metal | Oxidising Flame | Reducing Flame | ||
Hot | Cold | Hot | Cold | |
Cu |
Green | Blue | Colourless |
Brown Red |
Fe |
Brown Yellow | Pale Yellow | Bottle Green |
Bottle Green |
Cr | Green | Green | Green |
Green |
Co |
Blue | Blue | Blue |
Blue |
Mn |
Violet | Red | Grey | Grey |
Ni | Violet | Brown | Grey |
Grey |