Precipitates and their colour. (1 Viewer)

[Gussy Booo]

I have always wondered how precipitates generate their colours.
This might be a bit beyond the syllabus, but it doesn't hurt knowing.

How does it happen?
links would help.

E.g :
Copper and OH --> PALE BLUE PRECIPITATE
Iron (III) and OH--> BROWN PRECIPITATE

 

[mdmm92]

gus i believe it has do do with emission spectroscopy. When the compound is altered in a chemical reaction, the 'fingerprint' will change thus emitting a differerent wavelength and so the colour of the product may be distinct from its parent compounds.
however the colour depends on many factors eg the size of the crystals, nature of the parent compounds ect.
general rule all transitional metals produce coloured ppts except for zinc because all its orbitals are filled

 

[proletariat]

also, you're wrong.

Iron(II) + OH makes a white precipitate.

 

[Gussy Booo]

also, you're wrong.

Iron(II) + OH makes a white precipitate.

whoops white, but goes brown quickly >.<

 

[mdmm92]

white or green

 

[Gussy Booo]

white or green

White-Green ...

 

[ibbi00]

whoops white, but goes brown quickly >.<

This happens when iron(II) hydroxide oxidses in air to iron(III) hydroxide.

 

[mdmm92]

r u ready for tomorrow gus

 

[Gussy Booo]

r u ready for tomorrow gus

yeh...i guess so. what else can I do?<!-- google_ad_section_end -->