A solution may contain any or all of the following cations: Ag+, Pb2+, Ba2+, Ni2+ in an UNKNOWN mixture. HCl is added to the solution and a precipitate forms. That precipitate is removed and NH3 (aq) is added to the supernatant until the solution is basic, no solid forms. After making the supernatant basic, K2CrO4 is then added and a precipitate forms. What cations (Ag+, Pb2+, Ba2+, Ni2+)are present in this unknown sample (This is chemistry and not a writing question)

Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
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  1. A solution may contain any or all of the following cations: Ag+, Pb2+, Ba2+, Ni2+ in an UNKNOWN mixture. HCl is added to the solution and a precipitate forms. That precipitate is removed and NH3 (aq) is added to the supernatant until the solution is basic, no solid forms. After making the supernatant basic, K2CrO4 is then added and a precipitate forms. What cations (Ag+, Pb2+, Ba2+, Ni2+)are present in this unknown sample (This is chemistry and not a writing question)

 

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