Hot water is added to the precipitate and the mixture is heated to boiling. a) T

Question

Hot water is added to the precipitate and the mixture is heated to boiling.

a) The precipitate contains which "ion(s)"?

b) The supernatant liquid contains which "ion(s)"?

After the mixture is centrifuged and decanted, 6 M NH3 is added to the precipitate. A new precipitate forms.

c) The precipitate contains which "ion(s)"?

d) The supernatant contains which "ion(s)"?

Background: Group I Separation Scheme Group l Unknown 6M HCI AgCI, PbCl2, Hg2Cl Groups II, II, IV H20, Heat AgCI, Hg2Cl2 ppt Pb2*(aq) K2Cro 6M NH3 PbCrO yellow ppt,_ Hg / HgNH2CI gray ppt Ag(NH3)2 HNO3 AgCl white ppt

Explanation / Answer

Hot water is added to the precipitate and the mixture is heated to boiling.

a) The precipitate contains Ag+ and Hg22+"ion(s)".

b) The supernatant liquid contains Pb2+ "ion".

c) The precipitate contains Hg+ "ion".

d) The supernatant contains Ag+"ion".

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