This is an unknown solution which comprises of several ions possible for analysis. From the given information, determine which ions are present. Use + for positive, - for negative, or ? for insufficient information.
An unknown solution containing the ions listed to the right was found:
For Group I Cations:
1). A white precipitate was generated when 2 drops of 6M HCl solution was added to the unknown solution test tube.
2). Di water was added to the solution from part 1, and then the ppt was separated from the supernatant. The ppt was then washed with DI water few times to make sure is ppt is clean.
3). On the ppt separated from part 2 excess 6M NH3 was added and as a result all the ppt was dissolved.
For Group III Cations:
4). An addition of Excess 6M NH3 led to a basic solution and a ppt. The ppt was then separated from the supernatant.
5). When Excess 6M NaOH was added to the ppt from part 4, a brownish ppt was observed in solution. The brownish-red ppt was then separated from the supernatant.
6). To the supernatant solution from part 5 enough HCl was added to make the solution just acidic and then aluminon reagent with DI water was added and mixed well. Finally, when 6M NH3 was added until basic a flocculent “red solution” was not observed.
Ag+ _ __
Pb2+ _ ___
Al3+ __ ______
Fe3+ __ ______
Hg22+ __ _____
Zn2+ ___ _____
options are +,-,?
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