CHEM HW HELP PLEASE!?!?!?

Posted on 2017-04-26 18:23:00 in Chemistry by SCOTT

A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition of dilute HCl, no precipitate formed. The pH was lowered to about 1 and H2S was bubbled through the solution. No precipitate formed. The pH was adjusted to 8 and H2S was again bubbled in. This time, a precipitate formed. Which compounds might have been present in the unknown? 

The choices are (can be more than one): 
AgNO3, KNO3, Ca(NO3)2, Bi(NO3)3, Sn(NO3)4, Ni(NO3)2, Zn(NO3)2, Cr(NO3)3

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