a) Addition of HCl: precipitates Ag+, Pb2+, or Hg22+
No precipitate = rule out AgNO3
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?
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