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?
Here are some tests that may help:
CuSO4 + NH3 ----> deep purplish blue color when an excess of NH3 is used. That would confirm NH3. If no clues were given for the other colorless solution, it would not be easy to identify it.
Cu(OH)2, unlike CuSO4, has low solubility in water. NaOH would form gel like precipitates with CuSO4 and NiCl2.
thanks :) it brought in a bit of clearness in my head :)
Based on the information provided, it seems like you have correctly identified the solutions A, B, and D as CuSO4, NiCl2, and NH3, respectively. However, it is not possible to determine the identity of solution C with the given information.
To identify the solution C, you can perform a series of reactions using the known solutions A, B, and D:
1. A + B: If this combination forms light blue sediments, it suggests that solution A (CuSO4) reacts with solution B (NiCl2) to form a precipitate of a copper-nickel compound.
2. B + D: If this combination results in a purple solution, it indicates that solution B (NiCl2) reacts with solution D (NH3) to form a complex compound of nickel and ammonia.
3. C + D: If this combination produces brown sediments, it means that solution C reacts with solution D. However, it is unclear what the exact reactants are since the nature of solution C is unknown.
4. After adding solution D to the brown sediments, if the sediments dissolve, it suggests that the brown precipitate formed earlier is soluble in the presence of solution D.
To determine the identity of solution C, you will need to conduct further tests or have additional information about its properties or possible reactants. Without more details, it is not possible to definitively determine the identity of solution C.