[Threefinsout]

For my lab we must identify ten unknowns as follows:
Four of the unknown bottles will contain standard 6M reagents: HCl, H2SO4, NaOH, NH4OH.  Each of the other six unknown bottles will contain aqueous solutions of six out of the following nine solutions: Al(NO3)3, AgNO3, Ba(NO3)2, BiCl3 in 2 M HCl, Ca(NO3)2, Cu(NO3)2, FeCl3 in .12M HCl, SnCl4 in 6 M HCl, or Zn(NO3)2.  We cannot use any pH paper or anything besides distilled water, the reagents and test tubes

So far i figrued out that I know FeCl3 because it is yellow
The AgNO3 should appear blackish but if not, I can combine it with FeCl3 and it will form a white precipitate.

FeCl3+NaOH will give a brown precipitate and so will FeCl3+NH4OH.  I will be able to distinguish between them because NH4OH will have a stronger odor.

I also know if i combine AgNO3  with HCl i will have a white precipitate
H2SO4 + Ag(NO3)2 will form colorless crystals that are darker in light

If H2SO4 is pure it will be yellowish brown when exposed ot light

Also, if i add NaOH to Al(NO3)3 it will form a white precipitate at first but will then dissolve

lastly, if i add h2so4 to ba(no3)2 crystals should form instead of cloudiness.  this solution should form the most precipitation compared to others

Sorry for the length of this but it was my best attempt at doing this.  I would appreciate any help about how to determine, BiCl3, SnCl4, Cu(NO3)2 and Zn(NO3)2

Thanks for the help i appreciate it

[Borek]

Just a few remarks:

Copper solution is blue.

Sulfuric acid will not get yellow on the light.

Zn(NO3)2 is the only of the solutions you have left with that will not precipitate AgCl when mixed with AgNO3.

[Threefinsout]

sorry i also forgot to mention Ca(NO3)2 which im guessing will not precipitate with AgNO3

i also meant h2so4 will turn yellowish brown when exposed to oxygen

also, will any gas evolve from mixing any of these? or produce an exothermic/endothermic reaction that will be noticeable by touch (hot/cold)

[Borek]

H2SO4 will not trun brown even when exposed to oxygen. It will not change color unless you will add something.

Can't see any gases evolving. Perhaps NaOH and NH4OH mixture will get more smelly then just NH4OH.

Neutralization reaction is exothermic and you can probably feel it.