Doing a qualitative analysis, and having trouble finding the cation/anion. If anyone can help me find out what the hell the compound is, I'd appreciate it greatly. I have guessed three times, with both the cation and anion being incorrect. I guessed NH4NO2, Ca(NO3)2, and Mg3PO4. Both parts of each of these three are incorrect. Below are a list of the characteristics, as well as the cations and anions it could be.
The compound is a colorless crystalline substance, that is very soluble in water.
When using blue litmus paper, the paper in a solution of water and the unknown turns the paper VERY slightly reddish.
When doing the flame test, the flame is a slightly lighter color orange than the flame when using no sample.
The ignition test turns the unknown into a liquid, and when cooled, the substance crystallizes and creates a 'film' that is cracked.
When put in dilute 6M sulfuric acid, the unknown turns slightly yellow. When this mixture is heated, the unknown produced a reddish-brown liquid, and an awful smell.
When put in concentrated 18M sulfuric acid, the same effect is shown when burned, but much more volatile. A greenish-white gas is produced, and emits a disgusting odor, an augmented odor seen in the 6M.
When a few drops of 6M NaOH is dropped into a solution of the unknown and water, a precipitate is NOT formed. and there is no noticable effect.
The possible cations are Li, Na, K, Sr, Ba, Fe, Ni, Cr, Co, Cu, Al, Zn, and Pb
The possible anions are a carbonate (CO3, HCO3 doesn't matter, C2H3O2, SO3, SO4, Cl, Br, and I.
I can only guess incorrectly a limited amount of times, and this is my class final. Any help is appreciated, thanks in advance.