i am a member of a competitive team of physical and natural scientists at my high school. we compete in various events and i serve as the chemist. one of our events involves qualitative analysis, which isn't terribly difficult usually, but given the restrictions they put on us, it appears to be quite difficult.
if you could give me feedback on my work and help me with things i am missing, i would be greatly appreciative.
-test tubes, stirring rods
-any ONE of the following: 3M HCl, 3M NaOH, 0.1M AgNO3 or phenolphthalein
we will have to identify any number of the following solids:
-NaHCO3, Na2SO3, Mg(OH)2, CaCO3, NaH2PO4*2H2O, NH4Cl, ZnCl2, KI, KOH, Al(NO3)3*9H2O
CaCO3 will be easy nomatter which reagent i choose, as it is insoluble in water
if i use the HCl, i will notice bubbling with CaCO3 and NaHCO3, and feel an exothermic reaction with Mg(OH)2 and KOH (and also Na2SO3??)
if i use the NaOH, i will notice a reaction with NaH2PO4*2H2O, NH4Cl, Al(NO3)3, (ZnCl2 perhaps?)
if i use the AgNO3, i definitely will precipitate the halides, so count out NH4Cl and ZnCl2, KI, and i'm not sure but perhaps Na2SO3, Mg(OH)2, KOH
the phenolphthalein would indicate Mg(OH)2, KOH, and perhaps CaCO3?
so i think the silver nitrate would be the best reagent to use, although i may be wrong in its capabilities. if i am, please let me know. the problem is that nomatter which reagent i choose to use to aid in my analysis, i will have a lot of precipitates that will be less than easy to identify and a lot other unaffected chems.
i suppose i could use solubility, although i do not believe we will be given a balance and i know we are given only 10g of each of the solids. thanks in advance