ISSR CLASSES
Checkpoint Science
iGCSE Chemistry
iGCSE Physics
iGCSE Coordinated Science
A-Level Chemistry
PRACTICALS
Practicals Home
Practicals A-Z
Study Plan for Practical Work
The light blue precipitate is copper(II) hydroxide, formed by the reaction between the copper(II) ions and the hydroxide ions present in the alkaline amine solutions:
|
Cu2+(aq) + 2OH-(aq) ⇒ Cu(OH)2(s) |
The complexes with the ammonia and the butylamine are similar royal blue colours. The complex with the arylamine, ethyl 4-aminobenzoate is light green:
The formation of blue and green complexes by amines on adding copper(II) sulfate solution can be used as a test for amines.