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March 31, 2015

Homework Help: chemistry

Posted by Ksenija on Saturday, December 27, 2008 at 2:52pm.

Hi. I have a little problem with my chemistry task. I have 4 unknown solutions: 1 light blue (A),1 green (B), 2 without colour (C & D).
As I understood that the blue one is CuSO4, green one is NiCl2, but 1 uncoloured is NH3, then...
A - CuSO4 [couldn't ir be Cu(OH)2?]
B - NiCl2
C - x
D - NH3 [couldn't it be NaOH?]
It's said that when combine A+B+C then nothing happens. A+B -> light blue sediments, after adding D the colour becomes intensive blue/purple. B+D -> purple solution. C+D -> brown sediments, but after adding D, sediments dissolve.
Did I understand it correctly, if so, than what is C?

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