Unknown blue salt with anion SO4 2-. Finding Cation....(Gen Chem II Lab)?

Question

I am in Gen Chem II lab studying general unknown salts. My salt was blue, like sky blue?

I went through the anion process and found SO4 2-.

Afterwards, I dissolved some of the salt in H2O. I mixed this solution with NH3. 
The solution turned dark blue like aqueous Copper (II).

Do I have CuSO4?

I was told I might of done the process wrong because I did not remove my anion...... 
and I was told I might of done the process wrong because I did not add HCl, Ta, NH3, centrifuge, decant, and etc... (a whole process of precipitating group II ions).

However, I was with my lab professor and she said I should go ahead and use the new solution and just add NH3, but she's not the main lab professor.. so I just want to make sure I did this right.

Thanks!

Reginald · Accepted Answer

If you were given a salt that consisted of just one compound, you probably did
it correctly; your description indicates what will happen if you had copper sulfate.
However, one more test to be sure it is copper is to put a piece of more active
metal into the solution and see if a copper deposit forms on the metal.
An example is to put an iron nail into the aqueous solution of blue salt and if a
coating of copper forms on the outside of the nail, you have CuSO4.
If your salt contains just one compound, there shouldn't be any need to go
through the whole precipitation of Group II ions, since only copper is present.

rieder · Answer

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Unknown blue salt with anion SO4 2-. Finding Cation....(Gen Chem II Lab)?

2 Answers