Some Important Qualitative Analysis Tests And Results………

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