You are provided with an unknown solution that contains Group I cations. To 1 mL of this solution you add 6M HCI and obtain a

Question

You are provided with an unknown solution that contains Group I cations.
To 1 mL of this solution you add 6M HCI and obtain a white precipitate. You centrifuge the solution and add an additional drop of 6 M HCI to insure that precipitation is complete. No additional
cloudiness formed upon the addition of one drop of HCI and the supernatant solution was
decanted and discarded.
After washing the precipitate, centrifuging, and discarding the wash, 1-2 mL of water is added to the precipitate, the mixture is heated in a boiling water bath for a few minutes with stirring. The hot mixture is centrifuged and the supernatant transferred to a clean test tube separating it from the remaining white precipitate. One drop of 6M acetic acid is added to the solution. stirred and
followed by the addition of a few drops of 1 M K₂CrO4 solution. The formation of a yellow
precipitate was observed.
To the precipitate that remained in the test tube is added approximately 10 drops of 6 M NH3 and mixed thoroughly. All of the white precipitate dissolved.
To the solution 6 M HNO3 is added until it was acidic to litmus and produced a white precipitate.
Based on the observations and information provided, identify the ion(s) present in your unknown
solution.
Pb²+
Hg₂2+
Ag+

Kunduz · Accepted Answer

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