A student was given a solid containing a mixture of nitrate salts. The sample co

Question

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?

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? AgNO3 Cu(NO3)2 Co(NO3)2 Cr(NO3)3 Ca(NO3)2 Bi(NO3)3 KNO3 Fe(NO3)3

Explanation / Answer

Basic Salts will precipitate when pH = 8

Cu(NO3)2

Cr(NO3)3

Ca(NO3)2

Fe(NO3)3

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