guy - 16-6-2004 at 13:54
I have this unknown copper solution and I tried to precipitate it with NaOH, but the solution just turned to dark bluish-purple color. What was the
copper compund?
kryss - 16-6-2004 at 14:34
Was in the colour of Copper sulphate to begin with?
Maybe it had ammonia in that intensifies the colour
The_Davster - 16-6-2004 at 14:40
If this was heated or heated up when adding the sodium hydroxide it may be copper oxide.
Reverend Necroticus Rex - 16-6-2004 at 16:44
What actually IS the bluish color that develops on from a copper compound+NH3? is it the amide?
The_Davster - 16-6-2004 at 17:54
The blue color of a copper salt + ammonia is due to the formation of the complex tetraamine copper(II) [Cu(NH3)4]2+